Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b373bf6a86bcb9b…

MALICIOUS

PDF

75.3 KB Created: 2021-02-15 03:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 088930b4cd642bce9741dec6fdb83b60 SHA-1: a9f483bb46e6739c06a9e26272c5052a0eebbfc3 SHA-256: 4b373bf6a86bcb9b0445cba2de07b9d25bbc7c0911e0e790c187a63056ea93d0
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'yafferge.ru' as malicious. While no scripts were extracted, the document's structure and embedded URLs strongly suggest it's designed to trick users into downloading files, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=opera%20mini%20browser%20beta%20apk In PDF document text
    • https://lafefetakizin.weebly.com/uploads/1/3/2/7/132712235/be4bb.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/sidufuxana-nagevobo.pdfIn PDF document text
    • http://imkl-checker.com/89757026487mh1as.pdfIn PDF document text
    • https://cdn.sqhk.co/xekutenupi/nii3Nhh/51772997467.pdfIn PDF document text
    • http://educationonline.website/57551168015lx892.pdfIn PDF document text
    • http://chunyoo.com/dictionary_apk_for_pcv2xed.pdfIn PDF document text
    • https://namonivet.weebly.com/uploads/1/3/4/4/134493383/fejebego.pdfIn PDF document text
    • http://ropewelopison.iblogger.org/civil_non-_domestic_case_information_report_maryland.pdfIn PDF document text
    • http://helpcontactform.com/5496153224ew7r6.pdfIn PDF document text
    • https://cdn.sqhk.co/pagifizipafo/cxnuijd/dragonfly_svg_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/igcAjgN/juzoviz.pdfIn PDF document text
    • http://znakomstva69.space/sapibawatibutofuvujodo7ssfz.pdfIn PDF document text
    • https://fisuzawagowesus.weebly.com/uploads/1/3/1/8/131857314/rusuwanewukoku_fizupigun_fajugululavinot_bemaxepufun.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/fCZhevs/93312973930.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kubudafexajik.rf.gd/vujirejukolenotawotu.pdfIn PDF document text
    • http://xikisefux.epizy.com/sainik_school_nagrota_admission_form_2018.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/lidapakuni.pdfIn PDF document text
    • http://wugepigen.epizy.com/61928772484.pdfIn PDF document text
    • http://daboloxasorun.rf.gd/82945995830.pdfIn PDF document text
    • http://nazonuretowu.epizy.com/memonunojulufa.pdfIn PDF document text
    • http://wamesugome.rf.gd/35072253780.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_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 5256 bytes
SHA-256: 7e79ca1e88f50817ab9c43f8800e48063ac01bcf6ec9a8038cbd7a037c2fac03
font_01_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 10864 bytes
SHA-256: e8274c453875fb8f65bcb364c2411ac179bbcaa9c59671a94e1ed2329d656742

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