Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75636f4646e1cfb…

MALICIOUS

PDF

76.1 KB Created: 2021-05-27 17:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c4dd36230ba400e16e0d726aabcf07f0 SHA-1: 9132ac322179b94e77362f0f46030852afbd7aa0 SHA-256: e75636f4646e1cfb837308a55927aa5cbee11ca422a318ea3b559aa99abd69ce
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 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=10+depth+bar+stools PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419235/normal_60320124c6901.pdfIn PDF document text
    • https://toreliga.weebly.com/uploads/1/3/4/3/134335880/4063660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_6040e07be60c9.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/wifes-sarabodajaxojo-riled-dajiwexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_605dc057c982b.pdfIn PDF document text
    • https://nudimulax.weebly.com/uploads/1/3/6/0/136010194/3498242.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413227/normal_602654d54ec3d.pdfIn PDF document text
    • https://sutukukibefatu.weebly.com/uploads/1/3/4/4/134486522/jerotejufulax.pdfIn PDF document text
    • https://xuvunigito.weebly.com/uploads/1/3/1/1/131164310/wotikiw-zifosowas-kofuv-polujo.pdfIn PDF document text
    • https://siralukamowifi.weebly.com/uploads/1/3/1/4/131407299/3d626381.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_5ff2a257ca1ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_60164161b0eb1.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/6619987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_6042f06734564.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386089/normal_5fe48384e6ef5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412195/normal_6002aa30b59ed.pdfIn PDF document text
    • https://gumewixolasadaz.weebly.com/uploads/1/3/4/6/134659592/854728.pdfIn PDF document text
    • https://momitoxen.weebly.com/uploads/1/3/7/5/137514133/zowifuke-bofuxuxufasisop-farameleruwi.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/ac96ee01-9519-4cf1-9274-abf94bd0f27b/vibiweridirezap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd9d869-1a91-472d-b3b2-6104734c27bc/wefenexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c82724c2-d916-419d-a5c5-2da8731c084d/how_to_apply_vinyl_decals_with_transfer_tape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/622ae203-7bdc-42c5-8f8a-0c745e707ccc/aeschylus_agamemnon_summary_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ba2fe3-2bbb-41ab-8c50-4766a8e2b546/simplify_fractions_worksheet_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5c7364-a96e-406e-ab4c-599c35a0773c/sesavizofidakozuvusol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8e3dba-3e58-4f09-a595-34bc5642de76/nespresso_uk_promo_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d371279-efdf-4ac6-984e-0d45b85b6170/29560285044.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_off0000ec64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 5284 bytes
SHA-256: 2a6c073ee9e496f82dba7b7c6676c66d5bdfbd1ae3b350e9baa4ca1ebda61209
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 10608 bytes
SHA-256: 8f6daf26e295f93d20408ef773e7faca89dc1465ab7ab8dab217f86c90538678