Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9d435f25b8b7c5…

MALICIOUS

PDF

71.3 KB Created: 2021-03-09 15:50:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cb41dc1fe15af19cd23e45809f2795c0 SHA-1: de03f4aff42911f703fb5fea82e101206f9f7c44 SHA-256: ab9d435f25b8b7c56ca3203c8b24a6c54a1fd18a492a84a3159b82214cc2eb9b
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://botokaw.ru/123?utm_term=honeywell+digital+thermostat+owners+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376086/normal_601e8cc6308e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384318/normal_600f8e4ff1974.pdfIn PDF document text
    • https://tesiligozi.weebly.com/uploads/1/3/1/4/131407846/vaforixoxubukiveg.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/8741260.pdfIn PDF document text
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/xobopujimewojolidum.pdfIn PDF document text
    • https://memugili.weebly.com/uploads/1/3/4/5/134526503/2958285.pdfIn PDF document text
    • https://cdn.sqhk.co/lesebonun/hjk1uia/56978844059.pdfIn PDF document text
    • https://cdn.sqhk.co/loxusovi/ibUh8Xg/94479299308.pdfIn PDF document text
    • https://cdn.sqhk.co/kigakikijebo/g2ghVnw/whatsapp_funny_prank_video_download.pdfIn PDF document text
    • https://tirifojigem.weebly.com/uploads/1/3/2/8/132816165/wazesutaketojiwinot.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/8c5e3e6b-feb6-48c2-9833-499df2551a06/relapse_prevention_plan_therapist_aid.pdfIn PDF document text
    • http://daporev.epizy.com/acer_laptop_keyboard_not_typing_letters.pdfIn PDF document text
    • http://bekovomojuto.epizy.com/kalolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec24b029-8d07-4c14-93d0-c8567b7be0fe/gogetuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6406b689-c201-46c8-a9d5-650ad58a5236/93271773024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22fe4f27-2aea-4cf5-822c-df02622f360e/childrens_books_with_life_lessons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e64cd9-8092-4fdb-84a9-876e835b9117/62742219915.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_off0000dbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 5396 bytes
SHA-256: 2061cc560a6093af05e206b2eb21c48aa3182db58ea12d5bc11fa48d81056510
font_01_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 10044 bytes
SHA-256: f3df8c40c205e80dc05eed9be68588e552b9a3bd38d4b9695ba4f4ac8db38dd6

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