Malicious PDF — malware analysis report

Static analysis result for SHA-256 4169289622f3cbe1…

MALICIOUS

PDF

88.4 KB Created: 2021-01-28 13:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4729096cf1c424acb0c25ba2dea2a45a SHA-1: e56470dc035f51411729b86a8bb4dee4894f59ce SHA-256: 4169289622f3cbe1f31e220010480a4a5292d633d2ef1957555b4b0cf7fe03f6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and using UTM parameters, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the PDF structure itself is the attack vector.

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://druttle.ru/aws?utm_term=calamity+mod+melee+guide PDF link annotation
    • https://cdn.sqhk.co/bewewojiwo/cjcidic/78711408954.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/TVzp38e/juruwosonibibibudejolavil.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/cVyjgid/highway_patrol_accident_reports_ca.pdfIn PDF document text
    • https://roxewakedenal.weebly.com/uploads/1/3/1/4/131483042/sedupiguwawexem-xatok-vizakudejif-fefizufu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368486/normal_5ff491b8f2861.pdfIn PDF document text
    • https://cdn.sqhk.co/buwowunuras/jhCjdrQ/vinidesejigasogisujino.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/f538Ejc/87832456425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_5fd7d38ba7fbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5fc8272ef32d5.pdfIn PDF document text
    • http://mozujana.22web.org/dasodenukebaborugeluvegud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_6011678b877b6.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/c3c4e1325c70.pdfIn PDF document text
    • https://cdn.sqhk.co/jedesawu/hqDGiaJ/nibalo.pdfIn PDF document text
    • https://mawetifatine.weebly.com/uploads/1/3/2/6/132683292/wokupujepitexakojuru.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/Jhiib8M/guvakalo.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://dunedobaxapekir.epizy.com/gepidusigonovoban.pdfIn PDF document text
    • http://vedidutumi.rf.gd/dmv_vermont_accident_report_online_form.pdfIn PDF document text
    • http://bewukikakew.epizy.com/graphing_functions_worksheet.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 4772 bytes
SHA-256: bf5ab980bc285afb6d9edec1b6a4ce2de542a0b7e43bfc09bbe6f55d9b5f312b
font_01_sfnt_off0001212a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212A 10820 bytes
SHA-256: 83cd30e0953e5c7ac68f4a499a436b531cc643366ad9a4100775e627b89636b4
font_02_sfnt_off0001462f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1462F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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