Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b1915219fe20a1…

MALICIOUS

PDF

75.0 KB Created: 2020-12-24 09:14:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4ed1ffdc90bade3cada2704ad3db3cfb SHA-1: 7c37123e44ad48e497ad3af3f71597c1f5880b5f SHA-256: 72b1915219fe20a1e8a764c9601a36309a551df5edb64dc8a19c8b52f4ea0185
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a URL related to messenger applications. It also exhibits characteristics of a PDF link farm, with numerous external links. The ML classifier strongly indicates maliciousness, and ClamAV detected it as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?utm_term=messenger+lite+vs+messenger+2019 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4484356/normal_5fce5bef89819.pdfIn PDF document text
    • https://cdn.sqhk.co/liwewajawab/R2sw1gZ/mobile_home_kitchen_cabinets_remodel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488332/normal_5fd04fd4bb5b1.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/hbPijja/95850088373.pdfIn PDF document text
    • https://cdn.sqhk.co/purovufizu/Tja46EU/jixenolekutenalezovumobav.pdfIn PDF document text
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/zisex.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/fusidejebi/amazon_quiz_answers_today_vivo_u10.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/nurunibegovasebu.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/tesuvov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892862f0-b021-4e0b-8825-37c9480cdb41/94749928803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0686e1d7-dc19-4e00-969e-c72d654c2ce5/beauty_behind_the_madness_zip_sharebeast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a71dba8a-5429-4821-8fa5-1a1a700d21d9/asa_fastpitch_softball_rules_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/kalufizefem/genki_1_second_edition_workbook_answers_free.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_off0000dd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD64 5020 bytes
SHA-256: 62895545b4a2e3cb1705f4486da3c2d8422dfdaa13c8f2119999a8d413364b6f
font_01_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 10084 bytes
SHA-256: 0441751049f0c7d6907e05f7aead7686453e5f50c70f9c9d3d7a6ac8eb50ac9a
font_02_sfnt_off000110f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F2 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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