Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8cc2470ba336c2…

MALICIOUS

PDF

75.2 KB Created: 2021-03-15 18:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a77f944e5b5aeca771b0763f18a0de27 SHA-1: 99cde0b14e6d7ff738780b0e59b9171922b30e0b SHA-256: 4e8cc2470ba336c204c3beefb6cce755127131eaa7360759f1e3ed3a13007e35
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://midufefew.ru/award?keyword=makalah+statistik+parametrik+dan+nonparametrik+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412396/normal_6049fa45ede12.pdfIn PDF document text
    • https://zogoporev.weebly.com/uploads/1/3/1/3/131381602/3dc2f9.pdfIn PDF document text
    • https://mavipevawifuduv.weebly.com/uploads/1/3/4/5/134598931/9839043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420468/normal_5ffbbd88b2616.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/dexoje.pdfIn PDF document text
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/vujiror_jixowerifubuz_bewurap.pdfIn PDF document text
    • http://zitukuwekoba.sportsontheweb.net/nomenclature_of_coordination_complexes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413231/normal_5fd09cae33d29.pdfIn PDF document text
    • http://woronari.getenjoyment.net/zinisesubopovi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/55862226-46ed-41e4-a142-3d625dcf65ef/new_big_nate_chapter_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd58b80-d0e2-413d-9392-741661aaec0e/inspiron_3847_i5-4460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc93914e-02bc-44ee-8d0c-20cab7109103/how_to_install_micro_sd_card_samsung_galaxy_tab_a.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/raxofadujidukufow.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/86276229091.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/98335642969.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70eb8e5b-e946-4896-8be9-cd1c75368c17/kugeminikowopipozeli.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/979652709.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/kifejese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8c33869-8701-4906-ad0a-ca9c59f3673a/how_do_i_reset_the_password_on_my_honeywell_thermostat.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_off0000e67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67A 5352 bytes
SHA-256: 0a1f1cd3e5b1eadb2b29a7d6619c43dee38ac602326c74f02fe4d84de0962260
font_01_sfnt_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 11428 bytes
SHA-256: c53d8db953a2bd00aca6c7b65c8a2fd3a0440e94bca1dfc86e0a63d390d2327c

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