Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c48c1c09a4e604…

MALICIOUS

PDF

175.8 KB Created: 2021-03-20 13:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: dcc31f202a15f387995639eea15a5e28 SHA-1: bdf382794898f4e37bb04c7ec8c16791ea651fa8 SHA-256: 82c48c1c09a4e60498eb552e62e25573d83e5af3d59255cd2aa1e7fca2e5c6ad
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points to an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://resalured.ru/award?keyword=history+of+english+literature+age+wise+pdf PDF link annotation
    • https://kenomuxi.weebly.com/uploads/1/3/4/0/134042647/009eb1dfcdaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481397/normal_600028a77b326.pdfIn PDF document text
    • http://hq-cleartv.info/rutina_de_ejercicios_para_abdomen_hombresgpgh8.pdfIn PDF document text
    • http://dvestideyli.xyz/lanelaramulemilepavoburebbibxv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445106/normal_5ff1f9a220bf5.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/wooden_toy_truck_plans_freebnio5.pdfIn PDF document text
    • https://kubegagalinono.weebly.com/uploads/1/3/4/7/134714436/wukoruroxukuv.pdfIn PDF document text
    • https://ganunosor.weebly.com/uploads/1/3/0/8/130814229/f54aee90b4e4.pdfIn PDF document text
    • http://moresukko.ru/rodotexazaviduso10gtg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_603875ba65d79.pdfIn PDF document text
    • http://atelier-spb.com/38619340116oha7y.pdfIn PDF document text
    • http://astropsychology.site/the_dragon_reborn_map0yez0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5fd30778078a5.pdfIn PDF document text
    • http://faponabon.mygamesonline.org/brief_publicitario.pdfIn PDF document text
    • http://muzesumulel.getenjoyment.net/93575508802.pdfIn PDF document text
    • http://alexsaf.ru/wutemutixedotololepuzizhvunk.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/auditoria_interna_iso_14001.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d8ec88ce-93b1-4b83-b294-7016fd5b5063.filesusr.com/ugd/366252_32365fb8378c463a86fb4ba1b9eb082e.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_0c8f5a7fe4024891b956e35e0c84ed22.pdf?index=trueIn PDF document text
    • http://tuminexozuvino.atwebpages.com/ribbon_in_the_sky_lyrics.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_off00027258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27258 5456 bytes
SHA-256: 0db291fcde1d485589fb8e4bca132b4ab64a182757b96f72b56ceca4952c3cf8
font_01_sfnt_off000284f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x284F9 13764 bytes
SHA-256: 8d475ac9a3b77dcdd8a4ce773d23c058c4040625435153ba1f35d77b8d21e1e9

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