Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87b881c72157fea…

MALICIOUS

PDF

110.0 KB Created: 2020-11-16 19:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 150f23e2f36a5b834ac60041c1caa3ce SHA-1: 22cda8a3df764a4c953279ce0617302b5f5888ec SHA-256: d87b881c72157fea0e6ebdaf2cd749741ba97f76e9eed7747e3fd22477ea2838
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 0.9997

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://trafficel.ru/123?utm_term=anatolian+peninsula+political+map PDF link annotation
    • https://buritovetozew.weebly.com/uploads/1/3/4/4/134486370/47a205e5b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f875f623e51a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454561/normal_5fa21d7f871b9.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/3639528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_5fa2c935c7526.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/4622f989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386330/normal_5fa4b038385d8.pdfIn PDF document text
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/58e92cf.pdfIn PDF document text
    • https://xarupome.weebly.com/uploads/1/3/4/4/134469096/mofoju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476150/normal_5fa950c558a65.pdfIn PDF document text
    • https://putigazabikikim.weebly.com/uploads/1/3/2/6/132682718/rekojukevogutogagag.pdfIn PDF document text
    • https://denepuwukofakar.weebly.com/uploads/1/3/4/3/134316944/suvegiz.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/e142e6ce-c873-4df8-85c9-a40f2322342e/19061669551.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AD6 3212 bytes
SHA-256: 23e68007ff081ca4a67b7c6d985dd4117e52b31ee19ea70f44d09246acaa8936
font_01_sfnt_off00016668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16668 4972 bytes
SHA-256: ec67d6c270657b0cfa3e440b545b8222010f9d05a7048fa3c7557cc9a0f59835
font_02_sfnt_off00017742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17742 17568 bytes
SHA-256: 99b0695265493397215edf258d3acdd61a47a1d9e68d9eb76028c28d834d6e08

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