Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cfbe0f375ce0908…

MALICIOUS

PDF

70.3 KB Created: 2021-05-27 15:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 31761eb457cc4ead2636a72add792f59 SHA-1: 543d37d8bfca053fd01790f448193a2601ffe78d SHA-256: 1cfbe0f375ce09088bb450701ba316d8f11ddcba124884d58a1c736343eba322
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://xajibur.ru/strik?utm_term=joined+up+handwriting+practise+sheets PDF link annotation
    • https://mofagobebaz.weebly.com/uploads/1/3/4/6/134633285/tajefit-pexujuzebixe-sekivojika-tarowu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448330/normal_5fec046457e90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_60125acc23dac.pdfIn PDF document text
    • https://kigijizinelojuk.weebly.com/uploads/1/3/4/8/134848952/dajusutawosupowavutu.pdfIn PDF document text
    • https://kujiguvasate.weebly.com/uploads/1/3/4/5/134584602/sikir.pdfIn PDF document text
    • https://pajulabilo.weebly.com/uploads/1/3/4/6/134620642/d4f28a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_6010a753a5eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498992/normal_5fd1eacc92038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_6032a124a7bfe.pdfIn PDF document text
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/10ebe30a7be6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459776/normal_5fcc044356168.pdfIn PDF document text
    • https://bekajujoxofutit.weebly.com/uploads/1/3/1/4/131406668/a707d762dd9e.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/5af3d1ab-4e85-46ed-85eb-ffd115860f2b/21089822868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c2a848-3c1b-4dd8-9980-45c193c949c7/in_the_woods_tana_french_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c59c961-eef8-4968-803c-5deff13c10ec/43399845006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1be337fd-5298-4139-8b2e-981dbd97d221/graphtec_ce5000-60_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4f0736-044b-4508-8a75-4614f1bac95f/vusalodatereta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff91f67-64a4-4201-aaed-82810686601b/present_simple_affirmative_exercise.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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 5384 bytes
SHA-256: d86286b5de94736a3e620a00177431b77c2744a92adf15cca1d2ef5409348427
font_01_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 10172 bytes
SHA-256: 9310bc3f3a803c7adf9b2dbcf1e7d8193a53a06750d8eeb4fbccdac9028a16ac

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