Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b169b39c8e7ffa…

MALICIOUS

PDF

69.0 KB Created: 2020-11-12 21:50:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 22af710348285f29576a48ffe6450393 SHA-1: 15b6254224a18b90708a1c3a7ec2f4e322dfc66b SHA-256: e7b169b39c8e7ffa326f42e84ee2b4cf0240b48ce7b1927b43abfef6b5e3a900
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting it is part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The embedded URLs and the heuristic firings strongly suggest a phishing or SEO spam attack pattern.

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://trafffi.ru/aws?utm_term=fractions+to+decimals+worksheets+4th+grade PDF link annotation
    • https://melusibisi.weebly.com/uploads/1/3/4/5/134595399/gibusokir-xalozafujax-guzir-koxopan.pdfIn PDF document text
    • https://vomujozirokino.weebly.com/uploads/1/3/4/3/134318601/pewunopavikojatat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f8720a9430af.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/kopate-gosuxe-kuzebuli.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/vofovojetojijiwoka.pdfIn PDF document text
    • https://mozesewopizudal.weebly.com/uploads/1/3/4/3/134363743/8182343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369150/normal_5f8bc8c8efae6.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/nixitegilamije.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/0b8c6822-3f27-48ed-a351-a12685152c4b/72161310587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5f038d-df90-4aef-b3d0-d77d7869bec6/25341768747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a188c4c-ee70-4cbc-a33d-a0ded603f229/27947740450.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dbd11c4-2473-4fed-9f70-9a82da4f9b51/mindfulness_workbook_for_ocd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e653b1-abea-4dee-b25a-865acb7f88e1/zuzokebuwaranoxisenoxop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/610e8378-24d2-4a95-8690-5709622eaab1/piwow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad317b0f-f6fe-47c7-8deb-641e93c7150a/xidotuja.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_off0000ce2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2F 5552 bytes
SHA-256: 1bbc13ddce7293b6ce3361748a5dd16603c7a1fc4da22df5b9ec301b62045de6
font_01_sfnt_off0000e0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FE 11276 bytes
SHA-256: 4636f74ceb732d5d51ac2b32f4d43f1ad8f069018fc2547a862fdab1f3b294b9

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