Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81f0a4578465519…

MALICIOUS

PDF

71.4 KB Created: 2021-02-02 07:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9a22164a885c2c8dc92c28fe2e5ab4f1 SHA-1: 75fb6783663730c5ca0c7a5ce4d8102f1daa91a8 SHA-256: d81f0a45784655193ec39af19b7e1a90f789c09cc718ebd8a68f187e4bd620a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/aws?utm_term=answerable+dictionary+meaning PDF link annotation
    • http://antileqphh.site/refraction_of_light_download_class_11g59y9.pdfIn PDF document text
    • http://knitfqph.site/67798097791tggsi.pdfIn PDF document text
    • http://trokot-new.online/gisizepowalevce7m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471945/normal_5ffe927e5a87d.pdfIn PDF document text
    • http://marketeuro.pro/cisco_access_point_controller_250474swq.pdfIn PDF document text
    • http://bizarur.iblogger.org/40503136204.pdfIn PDF document text
    • https://cdn.sqhk.co/bojojiweg/jnijidU/81792170754.pdfIn PDF document text
    • http://sabuxaki.22web.org/glass_ceiling_definition.pdfIn PDF document text
    • http://vebilodugisugod.iblogger.org/carrom_game_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/gufuluzibos/jfdCehc/name_all_destiny_s_child_members.pdfIn PDF document text
    • http://help-igcopyright.xyz/55903593880k0u1m.pdfIn PDF document text
    • http://cardioactiveitalia.site/16241968806o3nrx.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/KjajbPE/reriroguvakojitu.pdfIn PDF document text
    • http://naturwows.space/988576520434c1s0.pdfIn PDF document text
    • http://samelike.site/balenciaga_motorcycle_bag_dupencbcr.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/ie73jfJ/new_york_times_newspaper_owner.pdfIn PDF document text
    • http://help-verification.com/safizexarthqr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480899/normal_5fc91296bb846.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoxokukazo.epizy.com/maduronadika.pdfIn PDF document text
    • http://vepuguda.rf.gd/chipping_campden_school_sixth_form.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_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 5580 bytes
SHA-256: bb92983b723095092abf18ac2dc3bc038f190e902a5fe5b80fa8e6709b503981
font_01_sfnt_off0000ecef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 10444 bytes
SHA-256: f8bacc928b17b48598e124e0800ba755a2d035f1bed2f4748ee70aa2e186c52d

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