Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa1b228a6f2c2fe…

MALICIOUS

PDF

72.8 KB Created: 2021-06-10 06:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 33c7d27d610bd7ae0ef440624b4a6228 SHA-1: c44b32be257ee0132405bd0bb0480d3e378d7c19 SHA-256: 4fa1b228a6f2c2fe2b3d95bd6b4e2744474bed4e2d6558843b78d1f9ad50e89f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by both ML classification and ClamAV. It functions as a link farm, containing numerous external links to PDFs hosted on disposable domains, a common tactic for SEO manipulation or distributing malware. The presence of the 'utm_term' parameter in one of the URLs suggests a potential phishing or spam campaign context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/pbw?utm_term=stoichiometry+part+1+worksheet+answers PDF link annotation
    • https://regajuwanuduxis.weebly.com/uploads/1/3/4/3/134319991/zukogawax-masudulagosi.pdfIn PDF document text
    • https://zifereli.weebly.com/uploads/1/3/4/3/134347484/zinaxegajuruv_vegubik_luxuteritudo.pdfIn PDF document text
    • https://penomagara.weebly.com/uploads/1/3/2/6/132695387/velosopeja.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/6131429.pdfIn PDF document text
    • https://nitegira.weebly.com/uploads/1/3/1/0/131071289/8975351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492275/normal_5ff2aad28017d.pdfIn PDF document text
    • https://fewabupa.weebly.com/uploads/1/3/4/5/134584226/boluzojenu-zavesujazo-misogemegi-zoruwutivipebi.pdfIn PDF document text
    • https://geguromivakof.weebly.com/uploads/1/3/4/3/134332909/sobuvemaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413235/normal_606114301e68a.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/82d466ad50.pdfIn PDF document text
    • https://polemezal.weebly.com/uploads/1/3/1/4/131452876/goxoruliviluxu_sigepanuf_soboguloruvetu.pdfIn PDF document text
    • https://todijaxazifaro.weebly.com/uploads/1/3/4/3/134342800/jitimevoxiwaf-kukox-xuribelekatowem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401691/normal_5fdfd8516df00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_600e09028fcf2.pdfIn PDF document text
    • https://pefipufipukota.weebly.com/uploads/1/3/4/0/134042651/7469781.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_5fdb30276be04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144846405/gidezajupuv.pdfIn PDF document text
    • http://guronavageba.pbworks.com/f/aladdin_connect_factory_reset.pdfIn PDF document text
    • http://mogulobobis.pbworks.com/w/file/fetch/144674193/19456849199.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_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 5552 bytes
SHA-256: ab85e199eee94850b703a29228113f25cf922d07e2e3a450f3e56df69ed21dcf
font_01_sfnt_off0000f08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08F 10952 bytes
SHA-256: 57fd732accfa1995f7e848eee4216c74a730c5e5defdb0398ab2b790048f7b7f

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