Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8d4b054661cac7…

MALICIOUS

PDF

69.8 KB Created: 2021-03-16 21:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6184cffb8ed71c323033e3bee3d052fb SHA-1: 2cae12a8ac49e02a8a87e12b4ecfc5a8032d59eb SHA-256: af8d4b054661cac75251f03dd3abd6b173c33de0834abc8e24b2dc7a7689de6a
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://seumenha.ru/wix?keyword=study+guide+questions+answer+key+the+picture+of+dorian+gray PDF link annotation
    • http://fobexugelego.getenjoyment.net/5928539678.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/juwogobema.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/njc5jHj/love_songs_ringtones_telugu_2020.pdfIn PDF document text
    • http://ponaxamewimenul.sportsontheweb.net/85365658157.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/LVAhdtf/halloween_coloring_pages_for_adults_to_print.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_6005fa98f1f24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379046/normal_5ff7a538b67f3.pdfIn PDF document text
    • https://cdn.sqhk.co/xosaletozobi/OJjahej/brain_teasers_worksheets_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/ifjiFgd/1392072458.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_5f0ce3335c024ebe8c86d2109a51c0b1.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_bc175f80ef344d64918b36d206029ecf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f72e70a-3513-435d-a18d-26b1c66f4295/pofun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb405cb9-68bb-4e19-a0db-3e4d49a56ae7/origami_heart_envelope_step_by_step_instructions.pdfIn PDF document text
    • http://pozijawikubinun.myartsonline.com/27373934438.pdfIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_fbd66607aca94caca77384d269b9f4e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ceb6650-14ea-413e-b478-226fb917d85b/tuvonugavuxowumane.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_off0000d15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15C 5872 bytes
SHA-256: c500923e743ead18e2961e869c597e6dfd4553a941196422fa5ac33f5b69db7f
font_01_sfnt_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 10824 bytes
SHA-256: 352cd5eaf6bf2bf0fb5a548903b1b2ee9da5ebbf81e9b9b21adf08339eb600cd

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