Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81098259a7c4c71…

MALICIOUS

PDF

68.0 KB Created: 2021-03-28 07:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d44095665016968aa0322581d1e2d578 SHA-1: 52c44d86c49a8b309979966ce35ab70a26800e34 SHA-256: e81098259a7c4c716439d09a62e471101f572e739cbef20a84c2a5ee9a0a9d0e
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=mercedes+c200+kompressor+2020+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366375/normal_604e79f3b43d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_6048fb381af09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_6049d9fa69862.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/benim_hocam_2020_kpss_tarih_video_ders_notlar.pdfIn PDF document text
    • http://inostrana.com/proving_triangles_congruent_worksheet_kutajzspl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_602af9fb94e06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379859/normal_605accfe35d5a.pdfIn PDF document text
    • http://kengoru.space/case_in_point_complete_case_interview_preparationqeozz.pdfIn PDF document text
    • http://chebsvet.ru/66254734478p33qr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376858/normal_5fe10972bcf58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_602caef68d5d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_6014c4d867521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_60419773d2a62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387589/normal_5ff63a18399d8.pdfIn PDF document text
    • http://mibotirekusiw.mywebcommunity.org/blessed_assurance_chords_d.pdfIn PDF document text
    • http://bufo.online/35519872215ieqmr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380088/normal_5fd06530f0904.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_0a699c7061804d0c90a2c2e96d86590e.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_4fe81dd855be400a975d9b925defa72c.pdf?index=trueIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1F 5644 bytes
SHA-256: 4c25ec50b18ea43acee9b9f774518811b9b7f73308ef582a39c430d9d9abe75e
font_01_sfnt_off0000df4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4B 10448 bytes
SHA-256: f1a43a2dccedd747185c3f45fd9e0408b8bbdade8217d58fa956e5a732855264

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