Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb812e58c4bd12f0…

MALICIOUS

PDF

77.7 KB Created: 2021-03-24 12:10:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6182201452d656bc266ebbfed803f40f SHA-1: 524181638c3d26c1a43b411353a9729559d5e986 SHA-256: fb812e58c4bd12f05674657b12aeb0b42c96e5ae829f86b7b23eeb32b32d39d5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/wix?keyword=frigidaire+gallery+oven+user+manual PDF link annotation
    • https://cdn.sqhk.co/vefusujix/jj4kihf/slendrina_the_cellar_2.pdfIn PDF document text
    • https://cdn.sqhk.co/puburikob/Mhb8aVV/soccer_modern_tactics_alessandro_zauli.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusetoteji/hgjpoud/portal_3d_model_thingiverse.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/HhjCjbU/58440081862.pdfIn PDF document text
    • https://cdn.sqhk.co/fidinananale/iTjbVhd/62367684021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387924/normal_5fef52d78765d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_60391692bec85.pdfIn PDF document text
    • https://cdn.sqhk.co/sukexesi/jhb4VgT/android_games_run_in_pc_software.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/hcjjjJo/startpage_vs_duckduckgo_vs_searx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_601b8cc2a4f01.pdfIn PDF document text
    • https://cdn.sqhk.co/pavujakorige/cmjehcI/neighbors_2_imdb_parents_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_60384175d5364.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490529/normal_60039b148547d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_bcd213b9d5994402aee53e2d9f9f0d98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/medical_drug_book_free_download.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_b2fb87bb82fe4028b61597b3c69167c9.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_37df51120a4348c5a7b7b040107b43cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fb199c2-f1d6-4fa0-87cc-fa72fc6a69c0/30613997653.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/room_reservation_system_open_source.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_34a1ac90b3ae40c2ad3fcfc99bff84ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/nukajexowewekojajofi.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/69655067863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4e8414-635b-4a1c-9956-57f6418514d8/what_is_the_wealthiest_country_in_asia_per_capita.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/american_journey_dog_food_ratings.pdfIn 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_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 5260 bytes
SHA-256: 15acf26d3cd15d9c1115a433dd7d42948e3a0bbcfd86f66908e0beb9a1991639
font_01_sfnt_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 11256 bytes
SHA-256: d61faaf08d08e0b23e9cf665797a73ec3af33e53fd1b83b52cdea4a4e477532c