Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c31686e8455768…

MALICIOUS

PDF

68.5 KB Created: 2020-11-18 10:54:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8ec60df4eb3199c42505ba894101826d SHA-1: 0043b144b777d0d9b5e24f4841b7b59aedb9917a SHA-256: d7c31686e8455768c77dc6b8989abb061664f03c4dcb959e0d7a035cdd7a5bdc
156 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 5

  • 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.
  • 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/123?utm_term=ronco+food+dehydrator+recipes PDF link annotation
    • https://gewupokisata.weebly.com/uploads/1/3/4/6/134606569/dufalos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390374/normal_5f9264fe9ecb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5f90344523520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483345/normal_5fb3dacba62ea.pdfIn PDF document text
    • https://wowomake.weebly.com/uploads/1/3/4/6/134679477/b2d574f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f98326de706c.pdfIn PDF document text
    • https://nenuxigibasus.weebly.com/uploads/1/3/4/6/134694542/watejazuremijudu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/debiwelof/chemistry_acids_and_bases_packet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/767bc6dc-7e26-4ce5-8740-b2aa492a9de7/vupowufuwisibar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90cef7b9-73ce-4392-ba67-e8ddb07314fb/nimowidedimoriwosuzunes.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/regatimakebereresivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1eafc1-5a0d-4525-ad62-1977b00f8aa7/vubafofusufex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ad46db-5997-49e3-8ac2-20cb6769bfa8/11117914775.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32d0c8c-9631-4ba2-b229-bfcd252ff167/keto_diet_menu_for_beginners_free_pd.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/frat_letter_crossword_clue.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_off0000ccd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD6 5320 bytes
SHA-256: d102ac5bd4fb03ece77946bcc04295d92d7ec84cd0583efdc774b5a1a869d2b2
font_01_sfnt_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 11324 bytes
SHA-256: 8ba1e37e7d12412bd35479f7d637ac35bdfe58c5d9e087f0147e4345d2e4b60d

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