Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c4bf039710ec47…

MALICIOUS

PDF

97.5 KB Created: 2021-03-22 19:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c1b718d62675490aa7fb3506db9463ec SHA-1: 206355393ff471909f1d6c41efa00b5d0e9096fa SHA-256: a4c4bf039710ec47c187445181c0e034e1be93688a7bf33d84bd0c2e365e0b33
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or conducting phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://botokaw.ru/strik?utm_term=le+petit+prince+movie PDF link annotation
    • http://fivadoguna.medianewsonline.com/the_physiological_basis_of_veterinary_clinical_pharmacology.pdfIn PDF document text
    • https://cdn.sqhk.co/vewukiziwemi/gjic339/best_short_love_letters_for_him.pdfIn PDF document text
    • http://xuvepawa.iblogger.org/65225359193.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/dyson_animal_vacuum_cleaner_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/tavevalurov/X07E0jc/bloomscape_carnivorous_plants.pdfIn PDF document text
    • http://zeropium.com/how_to_choose_the_best_roombamiuj6.pdfIn PDF document text
    • http://begetus11ppz.xyz/dmv_ct_test_questions_and_answers_spanishhk05a.pdfIn PDF document text
    • http://tamawasobo.sportsontheweb.net/belupowuxudon.pdfIn PDF document text
    • http://idealicacolumbia.site/fupuzebeviwimomepenubusisoamg.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/dqhjkRR/muzezawulimivujig.pdfIn PDF document text
    • http://yewes.space/how_to_use_gimp_2.10.18xicoy.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/ZhiYl7U/jevugijuli.pdfIn PDF document text
    • http://smirnoff-optic.com/fodolabez8sbzu.pdfIn PDF document text
    • http://nunegotopexipo.iblogger.org/herbarium_sheet_size.pdfIn PDF document text
    • http://streamsweets.com/nitiwosupapu1p6ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_cbe2a88eab324a5d9faf9b9da0d1cd85.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_19101ccabdce4a2e9c43169f762d4c79.pdf?index=trueIn PDF document text
    • http://nenilezum.epizy.com/7856993032.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/najoparulijulaxinedajev.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AD 3212 bytes
SHA-256: 903d1e7b64ff7f301626f87da8a8b4a4c72b1c155e8175bc3364591eb38ec4b5
font_01_sfnt_off00013f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F24 4660 bytes
SHA-256: abfe8689bdef4ddaa0c449413013c17d42572facc34b6cd768cfd9ec7e2f5f8c
font_02_sfnt_off00014ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF8 12620 bytes
SHA-256: 9bba8773d626db086ef875f10daa79a936088758f63dd9e1c11a41b6ba13a4b3

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