Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3e415cd88ad2afe…

MALICIOUS

PDF

79.6 KB Created: 2021-02-27 01:48:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 80556acbd15fa59cbd308114c33eb619 SHA-1: ad81131e184273bfa984d9b5f5ae92ab640d74e8 SHA-256: b3e415cd88ad2afe39315c1eafeac1da5c842565e752c7b95deb090ff221000a
186 Risk Score

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://soxebez.ru/wix?keyword=family+rush+2+unblocked PDF link annotation
    • https://mumovukejepi.weebly.com/uploads/1/3/1/4/131483147/3884297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_60123aecb4b8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5fd79ba26f5c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462982/normal_5ff8700d4d0ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5fd161197f891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_600ba2fa9c9d6.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/tufosivedafejaf_dobemusodunaz_rabujijuxax_vebevivodudezu.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/lamugopogutusunuxafi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419847/normal_6004819ebc405.pdfIn PDF document text
    • https://dafavazama.weebly.com/uploads/1/3/4/8/134893815/c6ead4a198a.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/muxegeza/96880928738.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/the_painted_bird_trailer_ita.pdfIn PDF document text
    • http://zidezogopezir.rf.gd/basic_engineering_circuit_analysis_solution_manual.pdfIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/65716590083.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_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 5572 bytes
SHA-256: 9a962f14081145d4e0fc96365e0303a2e9dc1fbb988c165330406b4faa069603
font_01_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 11028 bytes
SHA-256: 6669ba64e618c90b321f85222b48db8c9d962deea26a9b2af39d2367cf01bd38