Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8fe68bbee3df60…

MALICIOUS

PDF

76.6 KB Created: 2021-04-05 13:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 492d4a50d0bf2fc4325e04fc71490770 SHA-1: cfa2bdbed943d0b308a5165987a0f96c83db905c SHA-256: 5c8fe68bbee3df603bf40bd0b2d10b1a93ddedfd9fea5c1d4f62add1a53d0827
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to disposable domains or link farms, indicating a strong intent to redirect users to potentially harmful content. The presence of these links suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=how+long+is+army+basic+training+during+covid+19 PDF link annotation
    • http://cozyplacefor.rest/2006_honda_civic_ex_coupe_service_manual9e79v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_6058a88fb1b10.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/jV2iexI/67048966787.pdfIn PDF document text
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/cc47f0baebcc8b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412413/normal_5ffc1aff798c2.pdfIn PDF document text
    • http://women-ita.space/basunudofilelizo6q6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470535/normal_604ef31dec498.pdfIn PDF document text
    • https://jaxanotev.weebly.com/uploads/1/3/1/1/131164383/2577540.pdfIn PDF document text
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/8a5ccac.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/hggh8Zh/nususapokire.pdfIn PDF document text
    • http://netzamka.ru/what_are_some_gluten_free_snacksx8zvr.pdfIn PDF document text
    • https://tuvukorop.weebly.com/uploads/1/3/1/8/131857527/vopibal-zurikogixewud.pdfIn PDF document text
    • http://13millions-warzone.store/50844684195a4s89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391624/normal_5ff35b82d08ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_602f959200686.pdfIn PDF document text
    • https://sovevalejuwup.weebly.com/uploads/1/3/1/8/131858043/c5d8d62a45.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5feb59c126aaf.pdfIn PDF document text
    • https://vipagavufedolaz.weebly.com/uploads/1/3/5/3/135350232/remosadazefegu-gidokaxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417314/normal_60023dd845b3b.pdfIn PDF document text
    • http://vivadoctor.ru/kobofakewemaqqczv.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/hjb7jbU/alchemy_jug_5e_acid.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 5824 bytes
SHA-256: 516a50b3fb230e52b19440b6ccc8e3e3bbd97aa6a65d0675fc8323317ff2d21f
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 10276 bytes
SHA-256: 10affd4c9df593efc339b3242fa814abc5ced7969cadbc42bcc2cc1d6ec239c9

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