Malicious PDF — malware analysis report

Static analysis result for SHA-256 642243ad08ab26bb…

MALICIOUS

PDF

75.2 KB Created: 2021-05-09 00:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 003464b66933ac38e944ea975c5097d8 SHA-1: 75bf9c2da425f1431482584c6d768c250f35f1e4 SHA-256: 642243ad08ab26bbed8b325cba7251a2bcf69c4bc8083810f329ea9eaffd0ce6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jottigo.ru/strik?utm_term=network+security+engineer+resume PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fc869813e96c.pdfIn PDF document text
    • https://cdn.sqhk.co/nilimijano/YvjjLhi/kewubili.pdfIn PDF document text
    • https://sozizupisez.weebly.com/uploads/1/3/1/8/131872239/7524462.pdfIn PDF document text
    • https://cdn.sqhk.co/purawewus/Eigjf2L/kikutatatadumalosivobop.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/igojxRW/top_up_smart_card_online.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/jcvjaMJ/dragon_ball_z_online_game.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_604ce548bed39.pdfIn PDF document text
    • http://bagajuz.iblogger.org/wrong_turn_3_full_movie_100mb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454967/normal_602964cfa4ae4.pdfIn PDF document text
    • https://cdn.sqhk.co/zatejurix/idYhzhf/airtycoon_5_mod_apk_android_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_60692825cd83e.pdfIn PDF document text
    • https://teduzagegoxow.weebly.com/uploads/1/3/4/4/134400331/3657007.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_60177a217ff3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489033/normal_5fc99fda76a3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480423/normal_5ffb443e77b0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462775/normal_5ff25854996b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388279/normal_5fc995463712f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387821/normal_602bedb529e5e.pdfIn PDF document text
    • https://xisidugaboker.weebly.com/uploads/1/3/4/4/134436298/wudiferulod_desizuwakosig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowonedof.epizy.com/english_arabic_illustrated_dictionary.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_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 5104 bytes
SHA-256: 76bd0bccf1c35a49ca5a9f0a994563f30c1cdc2ed7cbf6901988617e3497cd50
font_01_sfnt_off0000f9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B4 11212 bytes
SHA-256: 8bd713bb08e3c92dfb0cd202ce74d41498c5e4cbe284ce5342c8bb66c0df1a40

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