Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bf62f511db96c2…

MALICIOUS

PDF

69.8 KB Created: 2021-02-17 08:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: afe9c39ed43a966241d979d54824e9bd SHA-1: 55e04ad694f79175e37376ffde6d73fc7bedaa14 SHA-256: f7bf62f511db96c2c12f1d50d24051d9ec4b9af841a3abf2d653ed46f470f19a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable hosting or domains commonly used for distributing malicious content. The primary function appears to be directing users to a large number of other PDF documents, likely for SEO manipulation or to serve as a distribution vector for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wix?keyword=history+of+the+atom+worksheet%252Freview+sheet+answers PDF link annotation
    • https://cdn.sqhk.co/datawafag/7icFARj/42086032007.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/10a8efcf4440c9.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/puzibujabi_rosituro.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/GaheifL/20780413369.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/GwGidJv/talking_cat_leo_halloween_funko_pop.pdfIn PDF document text
    • http://fisutef.iblogger.org/uk_tv_guide_rugby_world_cup.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/ebejiUo/vegetable_chopper_electric_online.pdfIn PDF document text
    • https://gadufekovofu.weebly.com/uploads/1/3/4/7/134764592/votel_zodobode_dazuwikupeloges_pireberale.pdfIn PDF document text
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/zavado.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/daMihLC/5580746089.pdfIn PDF document text
    • https://jevokave.weebly.com/uploads/1/3/4/2/134266272/dejowinajebo.pdfIn PDF document text
    • https://linekepev.weebly.com/uploads/1/3/4/0/134041162/7bab6b76387dc3.pdfIn PDF document text
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/7b559db51d49fd3.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/aPhgjeQ/82713184.pdfIn PDF document text
    • https://cdn.sqhk.co/wavefekus/gijbmjg/fireboy_and_watergirl_light_temple_level_8_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/GicjiO5/narikujulif.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/eibidgi/license_plate_tracking_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fibotemirazopo.rf.gd/38477407804.pdfIn PDF document text
    • http://debetofewozuri.epizy.com/63002392752.pdfIn PDF document text
    • http://denaruzunus.epizy.com/kigexuluzemori.pdfIn PDF document text
    • http://joluromimazatub.epizy.com/52072671036.pdfIn PDF document text
    • http://mulusatore.rf.gd/what_are_good_interview_questions_to_ask_candidates.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_off0000d54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54B 5288 bytes
SHA-256: 53322aba7d86a90db96e5fad83a690ac8f477c7c6a561d4474af35a7a8937da1
font_01_sfnt_off0000e742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE742 10096 bytes
SHA-256: 870c266f81207a3abebff3869134aa65d3f1ce25a4ea3ac002229d8ad0647c9a

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