Malicious PDF — malware analysis report

Static analysis result for SHA-256 39fcf5561885e4c7…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 14:08:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5a59bb86a5b8f9a346ba4daca800db44 SHA-1: 5ad38301aebfaf1e0d214dfc2e9a5e75a2ba62e5 SHA-256: 39fcf5561885e4c724c82b9eb496fa80b7dbd133d30434f55c00a6c3ae31b438
324 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1553.005 Security Software Tampering: Disable or Evade

This PDF file is identified as malicious by multiple heuristics and ClamAV, indicating it is a phishing or trojan delivery mechanism. It contains numerous links, with at least one pointing to a known malicious redirector, and another to a link farm on disposable hosting, suggesting an attempt to obscure the final malicious destination. The document also contains instructions to disable security software and mentions password protection for archives, common tactics for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=skyrim+guide+direct+download+apk In PDF document text
    • http://topcreditscore.info/im_westen_nichts_neues_film_20057tgt2.pdfIn PDF document text
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/pidirexuvevor_lunolaramu_xevadepibufo_fekiromutino.pdfIn PDF document text
    • https://mufajagirudul.weebly.com/uploads/1/3/1/4/131452858/02b43357.pdfIn PDF document text
    • http://life-news.tech/tozexalijulirosupam68rh.pdfIn PDF document text
    • https://gekowodi.weebly.com/uploads/1/3/5/3/135321574/xazotazukavu.pdfIn PDF document text
    • http://ogranifruit.space/6666426757hfb1a.pdfIn PDF document text
    • https://pozusope.weebly.com/uploads/1/3/1/4/131453674/990e3efc8f3.pdfIn PDF document text
    • https://fiwaxajosikevi.weebly.com/uploads/1/3/4/8/134885015/9c06a21fb9510c5.pdfIn PDF document text
    • http://reduslim-italiaufficiale.site/67464263100ic82a.pdfIn PDF document text
    • http://expressday.online/kitchenaid_stand_mixer_sale_5_quartlrkfl.pdfIn PDF document text
    • http://idealica-co.site/xalikixamojiv1gi1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ce7f94-9647-42fc-8c0d-88a20284c3c0/6690449966.pdfIn PDF document text
    • https://3caa4030-7dd6-4be4-8a8a-e1981c45b3cd.filesusr.com/ugd/704988_6ef54a62382a46bab3390565764f3236.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01c4003-fe3c-45aa-8552-bff58ec83bb5/lola_lago_una_nota_falsa_summary.pdfIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_f892326c7cd3464298bf1a53f3d9444d.pdf?index=trueIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_5e177a7066a44dc69e16db53fc7b1e5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/791df38f-750d-4154-8a40-d612c9f02b20/diary_of_a_wimpy_kid_wrecking_ball_free_online_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b910fd01-c20c-4ac1-b522-58603665ce16/jokowipemunerizevikupum.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_57a5d39a69f54a0e97f5ce678cee2eff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa001b3-017e-4ad2-b5fa-4d3b88931d96/pet_sematary_original_full_movie_online.pdfIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_96e3f41124e84c86be862770ce3d7d3e.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_82fadf8eb59a454bb84f6b23fa432090.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_5df751813e9c40d9a89f07d582585ea1.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 5576 bytes
SHA-256: b803071b53bdb86653f21b088b85770320a97c87aa68dcfdeac1b6061fadb8a9
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 11132 bytes
SHA-256: 7b298d392f10c223efd52cba5bd5e0025db4990f8c0c15875d37a6c6d5f92655