Malicious PDF — malware analysis report

Static analysis result for SHA-256 de835f0abf2ec75c…

MALICIOUS

PDF

71.5 KB Created: 2021-02-11 22:19:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 4020a1341e022517607e1771b06b3a3d SHA-1: 00c9351764e4b1fcfba71a0cbcd069b73544093d SHA-256: de835f0abf2ec75c96ec4a18226026eccf488b1fa4aeb9487fe70d07f6dd4d56
206 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://druttle.ru/wix?keyword=vocab+workshop+level+g+unit+8+answers PDF link annotation
    • http://esplus.pro/lemobugafrstw9.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/dbdSmja/kukaduzukafit.pdfIn PDF document text
    • http://alphabitx.com/50222851933nw5o7.pdfIn PDF document text
    • http://newberginvestmentproperty.com/tagefapasad7sarx.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/gdnhfq8/multiple_email_accounts_on_ipad_mini.pdfIn PDF document text
    • http://streichpack.online/battle_ops_offlineg7pu6.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/ghiZR27/43774538277.pdfIn PDF document text
    • https://pewukuma.weebly.com/uploads/1/3/4/7/134762228/wegigekal-likupasaj-jexumureletun.pdfIn PDF document text
    • https://cdn.sqhk.co/xonivozew/ggjbujf/fukutoxesuwaxalodew.pdfIn PDF document text
    • https://gojamomer.weebly.com/uploads/1/3/2/8/132815882/c650481.pdfIn PDF document text
    • http://salearea.pro/the_last_days_of_judas_iscariotkjn7y.pdfIn PDF document text
    • https://cdn.sqhk.co/zititepu/Nibuwmr/65483498407.pdfIn PDF document text
    • http://yognat.space/56607988494pqsgb.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/pjjiNRF/reaction_trainer_for_pubg_free_fire_apk.pdfIn PDF document text
    • http://lestyprin.online/63215906998lao66.pdfIn PDF document text
    • http://rezonansmusic.com/wuxizuml5uv.pdfIn PDF document text
    • https://cdn.sqhk.co/pebekaja/dYJgnX1/56417159519.pdfIn PDF document text
    • https://cdn.sqhk.co/gijosevozu/gh6gcgg/ultimate_ninja_blazing_x.pdfIn PDF document text
    • http://jusapp.club/b._ed_exam_formnv7rp.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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 5708 bytes
SHA-256: 62bc060c7244886f16c3ddd08737566d94fbb812b75f528118c4cd79bbf55577
font_01_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 10040 bytes
SHA-256: 2a36e6ea60b74bc762381e80335dbc5335cea917a3f0ad1eec0e2eadaa144e11

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