Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a3c3e363ad2c20…

MALICIOUS

PDF

74.9 KB Created: 2021-01-25 07:46:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7d49f7df29a4df72dd0906242e4a0206 SHA-1: 3e242a1ffe6ced1a0fe2a1bf9d9e6360547911d0 SHA-256: d7a3c3e363ad2c20980f582d0d806c407ffb8446d34a6022e171b6e034fe4cbc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://trafftec.ru/aws?utm_term=top+engg+colleges+in+karnataka+pdf PDF link annotation
    • http://lastmarkt.ru/vimidirenaduxulijiwusodas1mmo4.pdfIn PDF document text
    • https://cdn.sqhk.co/fifotadog/FMRygfp/48451953029.pdfIn PDF document text
    • http://tisiner.iblogger.org/2104209727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_5fd9c203bec41.pdfIn PDF document text
    • http://velavedi.iblogger.org/32561143407.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415046/normal_60000d32eb206.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/winklevoss_brothers_young9btzq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404310/normal_5ffcb32fb29e8.pdfIn PDF document text
    • http://damita.fun/easy_cnc_router_projectsudff4.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/WDhct4j/home_design_paradise_life.pdfIn PDF document text
    • http://jelabenix.22web.org/arbeitszeugnis_schlussformel_bei_bernahme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sigobija/funny_birthday_card_template_free_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/64273108039.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/jofusavobedolutedufosa.pdfIn PDF document text
    • http://komopojanali.rf.gd/today_tamil_news_paper.pdfIn PDF document text
    • http://kababotatage.epizy.com/22849881216.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_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 5336 bytes
SHA-256: d1a4c8f3c6baa1e7fc1714c55d80f4bf1ee7e4f625aad6a01d12c39bc0e18964
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 11040 bytes
SHA-256: 3c55f8991f5160b336c14e3d9e65acaee575712eff447e8d14eaad79ce6d3840

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