Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21308b310fa6b98…

MALICIOUS

PDF

75.0 KB Created: 2021-03-25 16:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 80d64d6bc5882d2b793064ceee8b1285 SHA-1: cfdc6f8de848d871d0d795bc14b84bf0e7c481f1 SHA-256: b21308b310fa6b989b71b0a4b2938184ebd24874493b3d6251f61b750c8f0346
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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 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://crophysi.ru/123?utm_term=cash+advance+letter+tagalog+format PDF link annotation
    • https://cdn.sqhk.co/satidaruxami/QuSugdl/princess_dress_up_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461229/normal_5fcbe249d8e0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_603ba26c4b2e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_60226a3d27942.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/hhicU6a/japanese_anime_character_name_generator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_6049f16cd27d7.pdfIn PDF document text
    • http://kelimap.mywebcommunity.org/rerixisopuzilano.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/ejgoAs6/waxes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371514/normal_5fed112ca91bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461201/normal_5ff8db4e5c6f9.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/angielski_wszystkie_czasy_wiczenia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482413/normal_5fd78b4064df5.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/lawakux/the_strongest_love_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2576e7f2-84bb-4e01-be97-114d9a6f268b/47612315382.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/difference_between_daniel_plan_and_daniel_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ad63ac-61dd-4d27-a09e-758f9a329656/what_are_the_3_management_styles.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/92198990221.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/duzas.pdfIn PDF document text
    • http://jugomirusulove.atwebpages.com/fepolamiwexumi.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/96862424478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/effb2e5f-ab17-430e-bdd0-1af8437de867/kafuzigufifidalobowapen.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_off0000d991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD991 5260 bytes
SHA-256: 566d766612ed4c5b8fd2af40d5644f14e7f476a001f26ba5f40e668f7680a766
font_01_sfnt_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 10948 bytes
SHA-256: a65cef73c1cdcc4ec48bbc2d3160812e44e424ab3c53ec8add2b575f88d88c5e
font_02_sfnt_off0001106f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3