Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb25c2eaa354c64…

MALICIOUS

PDF

72.9 KB Created: 2021-02-24 03:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 66ef0b3616bb28303ec8e70f2fe5035e SHA-1: b38588dcc4c270a87f12eb8993236ad4a5d22615 SHA-256: 2cb25c2eaa354c64ed50cf1c24fa8fec3f4dbd45e3c4bb482d4e5e78a765835d
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 0.9997

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://crophysi.ru/123?utm_term=vegan+recipes+for+lunch+indian PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388050/normal_60226966dfffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5fea0c2c6f1cf.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/mubapuvuma.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/kepegudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368759/normal_5feb791f82fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460477/normal_5fd2f2b77fe66.pdfIn PDF document text
    • https://duketexu.weebly.com/uploads/1/3/4/7/134725944/bugasotamileru.pdfIn PDF document text
    • https://midunufi.weebly.com/uploads/1/3/4/3/134387712/kizojur.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/lidipilole.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388293/normal_5fe0b76f169f1.pdfIn PDF document text
    • https://sawinabepetejex.weebly.com/uploads/1/3/4/7/134714359/5924f9113e5b6.pdfIn PDF document text
    • https://negozikazaseju.weebly.com/uploads/1/3/4/5/134587396/7d622c32c7d79.pdfIn PDF document text
    • https://vegiranelikir.weebly.com/uploads/1/3/4/3/134399044/a1d56.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/guxosa/decimal_word_problems_worksheet_grade_4.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/alto_s_adventure_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/fimapevexexajedejuxitop.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_off0000e127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 5384 bytes
SHA-256: 0871bbcb18b0e7497a5ef8880609959e8d665cae3a93d928eaba25c7a3b18bc6
font_01_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 10460 bytes
SHA-256: b2a5d35054fdab396716af901edcd6aaa9e8218470aa42c5c73dce85668e2b2d

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