Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63d80aa412c5ced…

MALICIOUS

PDF

66.4 KB Created: 2020-12-06 14:14:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 508fa59995469356f772203b16764b71 SHA-1: 19fe3bd9bf681e93db6340746703d9f11c8d7032 SHA-256: a63d80aa412c5ced21ae45c8d91766623da84976cceddab8e0d46e17bf5216f0
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://trafficel.ru/aws?utm_term=6+point+pocket+chart+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482023/normal_5fbdc6f453e42.pdfIn PDF document text
    • https://kigixefowu.weebly.com/uploads/1/3/4/4/134496532/2be5049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_5fbd0bcb745fc.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/fesawigimovi-lofiwabiwovasif-vutujexizezi-budogi.pdfIn PDF document text
    • https://manabaxijex.weebly.com/uploads/1/3/4/6/134626004/d2211ff.pdfIn PDF document text
    • https://komanibinepo.weebly.com/uploads/1/3/4/5/134588578/5436292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365657/normal_5fbf502307d38.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/f1334.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/zanozudaw_kidosexoroli_pimidope_foduto.pdfIn PDF document text
    • https://jolamaripewefof.weebly.com/uploads/1/3/4/6/134655052/bebb4c40fbb207a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420031/normal_5f98dfcaeafac.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/5fb94e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf59593c02f22b9d047aa6/1606375769504/55534173084.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e70d1452f90b7fe56088/t/5fc519bc3f75b16643763f11/1606752702498/giwezokapuzosojen.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_off0000c63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63C 5460 bytes
SHA-256: a11ccb877744a95ec65f98a98c7b4a89c9604788d2231c331479a3c1db867e98
font_01_sfnt_off0000d8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 10688 bytes
SHA-256: dc66e20800e44f2f24d8f88e571a454012008efebf0878dfc81ffe3e571d6070

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