Malicious PDF — malware analysis report

Static analysis result for SHA-256 924185f2cabb0c59…

MALICIOUS

PDF

75.5 KB Created: 2020-12-24 20:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e0d61f05e82fa952789d6202031f5aa1 SHA-1: e8056b32d6e651f90cfee12ff6d6c1389fe2d278 SHA-256: 924185f2cabb0c592ee4db4bdc60df85901e22b2b4297363075e6e606a0ecff3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by both ML classification and ClamAV. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The primary URL observed is https://trafftec.ru/123?utm_term=universidad+del+norte+barranquilla+colombia, which is likely used to redirect users to further malicious content or phishing sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=universidad+del+norte+barranquilla+colombia PDF link annotation
    • https://lugagixoweliw.weebly.com/uploads/1/3/4/2/134234548/pijujumazopipadu.pdfIn PDF document text
    • https://nonililuwadev.weebly.com/uploads/1/3/4/3/134354571/916843275fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_5fae881c9eb30.pdfIn PDF document text
    • https://sezibuginodeso.weebly.com/uploads/1/3/4/4/134470526/dutavelegager-tubuverojefe-rinusufobomapiv-xokovu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406213/normal_5f93c15d81b7d.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/f6f8dbdf959.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/c7baaf961e7d4.pdfIn PDF document text
    • https://cdn.sqhk.co/zexukobesu/SQZicSX/simaxarenovofev.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/f73d1621-b175-4578-a7d7-0a826748763d/nixon_outsider_tide_watch_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad352ef-5883-40c9-a9a3-74730e19e37c/godiwifadopovorenaxit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c620f924-d4c9-40ed-914e-582e1d4d46bd/nps_yellowstone_webcams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/785bf12e-dc5a-4fb9-9d37-0f6d0ff94132/59558819136.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_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 5404 bytes
SHA-256: 8c52a27252b2e87866cfd0d42ec8f405dc712ad8a2bb17b6d8e7bf108a65c486
font_01_sfnt_off0000fbdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDD 11440 bytes
SHA-256: 4d9bc5bb98a3c2f62029dba310ca1eab1a8a8562038922cdb249c4fb0656d7e3

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