Malicious PDF — malware analysis report

Static analysis result for SHA-256 3977b2423dba33a0…

MALICIOUS

PDF

79.3 KB Created: 2021-03-17 03:38:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4b9c6aafbb10634a80a40405221e9e87 SHA-1: 6a1f07f13b0fdbd3f2afe502d89dd27aa35a4d67 SHA-256: 3977b2423dba33a083f57ba7eec7c576f8d55d355a914341f938f7716775b0d6
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 hosting services and employing URL parameters suggestive of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://pelibifir.ru/wix?keyword=animal+science+merit+badge+worksheet+answers PDF link annotation
    • https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/pirukezoxufevivuz.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofigeniso/FhbnigT/dajegizenewabawax.pdfIn PDF document text
    • https://wesaxewotivaf.weebly.com/uploads/1/3/4/5/134578523/xirarexi_nejaxowep.pdfIn PDF document text
    • https://cdn.sqhk.co/temirikuji/JOgiiih/free_slots_machine_games_to_play_for_fun.pdfIn PDF document text
    • https://cdn.sqhk.co/vonofuguniti/fw3ajcy/bullet_force_ios_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/vituxezij/Z2hdVic/negin_mirsalehi_boyfriend_birthday.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/ijXgihh/rock_band_vs_guitar_hero_ps4.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/timagurijotefuj.pdfIn PDF document text
    • https://cdn.sqhk.co/jizapamilizo/FieqhjO/98973477174.pdfIn PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/hfSigSt/71829989937.pdfIn PDF document text
    • https://muxojuwarerufi.weebly.com/uploads/1/3/5/3/135388895/xozibobegeg.pdfIn PDF document text
    • https://pufegigan.weebly.com/uploads/1/3/1/0/131070168/26b0e5d026d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415061/normal_5fe4a16063b5f.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/flrbieh/35273971507.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/hdshhgi/small_modern_sofa_bed_leather.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/Chfjfif/jogejajurusesa.pdfIn PDF document text
    • https://zovakilezogavi.weebly.com/uploads/1/3/1/1/131163957/fadd9e0791e.pdfIn PDF document text
    • https://cdn.sqhk.co/sejaganetaxa/hjY6iiT/4545055073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408482/normal_604173ea21ff8.pdfIn PDF document text
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/d5cdbbd626.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/ifgdagf/jufodekasuberomagugasu.pdfIn PDF document text
    • https://cdn.sqhk.co/jigixomavola/ryheifu/58922314127.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 5428 bytes
SHA-256: d5c10be4150b0479ab1a898a029020572919cfc9b6860a066468565303520f0f
font_01_sfnt_off0000ff71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 9820 bytes
SHA-256: 825b03a91e681c8bee8ae9ffc9d48c677f72b3efbb75f358da053eafe85d5624
font_02_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176