Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3ce4cf6e6eb0d7…

MALICIOUS

PDF

92.4 KB Created: 2021-03-03 06:45:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6e3f6d0e85e4e8b6bac45443c87c80a9 SHA-1: d44deb67db62c024d0f735b43dcab2bdb14c0d33 SHA-256: 7e3ce4cf6e6eb0d759d814ded487b30a2afddf7a33c18dad74bfd3c65c0733b2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicating a link farm designed for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=diablo+3+season+22+crusader+roland+build PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480753/normal_5fe9379a351d0.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/wonejopajinanuforelevi.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/8009667412.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/iji72ic/samsung_galaxy_4x.pdfIn PDF document text
    • https://cdn.sqhk.co/sunidoxil/Li7hblU/fruit_slice_master_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/nepusoliweda/gcbhhgc/stickman_turbo_dismounting_3d.pdfIn PDF document text
    • https://cdn.sqhk.co/zevukodixu/dja8qdD/zowogigozepujekapanup.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/mink_russian_eyelashes.pdfIn PDF document text
    • http://present-mag.ru/vpn_private_apk_uptodownmpbva.pdfIn PDF document text
    • https://fomiradoxep.weebly.com/uploads/1/3/4/5/134512134/3297749.pdfIn PDF document text
    • https://cdn.sqhk.co/xasakeza/iY4jjPt/subway_surfers_racing.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/galinikagopit/apple_skin_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/aspirin_different_dosage_forms.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 6424 bytes
SHA-256: e637e929042e3978bec96b31b3490ba660419ed310d31d627162007a830036f1
font_01_sfnt_off000115f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F8 5368 bytes
SHA-256: 4cbdfbdedf7157e6fb5fc4082d511d37e5a94f0ca788a5a849767fea0b8a103e
font_02_sfnt_off00012840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 11228 bytes
SHA-256: 094ad3013c4786bea13a2182553f39ffa0ad19ac55b853e392c19d503b1c76ab
font_03_sfnt_off00014e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E7D 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174

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