Malicious PDF — malware analysis report

Static analysis result for SHA-256 3687ce1cf4d3f155…

MALICIOUS

PDF

78.0 KB Created: 2021-03-15 10:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1eb80aab14ba8d8c6424ae0bdd34a66a SHA-1: b6c447109fd6f7dc67eb9514db7e8f567ce206bb SHA-256: 3687ce1cf4d3f1551653f11db192e645d79d630106afd6e9e7e029b87d5c5043
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to product searches, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=toshiba+satellite+l775d-s7112+battery PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470409/normal_604d07e310fc1.pdfIn PDF document text
    • https://fapuwokezisojo.weebly.com/uploads/1/3/1/4/131453853/3143597.pdfIn PDF document text
    • http://mudopuxez.22web.org/vertical_asymptotes.pdfIn PDF document text
    • http://gekiwejal.scienceontheweb.net/changing_to_word_on_ipad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450046/normal_5fcdf44a1448b.pdfIn PDF document text
    • https://nufawufaza.weebly.com/uploads/1/3/0/7/130740177/gogirenumenip-zuzuvigomegipe-nudawuwi-redemuniget.pdfIn PDF document text
    • https://mamifonor.weebly.com/uploads/1/3/1/1/131163935/taviwuvasukimikugu.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/carl_rogers_theory_of_personality_in_hindi.pdfIn PDF document text
    • http://sfr-webmail.com/arteries_of_the_upper_limb5ygqb.pdfIn PDF document text
    • http://begemotiks.space/taremamevelulaluzozturze.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/how_to_put_yes_indeed_in_a_sentence.pdfIn PDF document text
    • http://jilavixit.medianewsonline.com/22544081388.pdfIn PDF document text
    • http://raicen.com/ledizufexesu2vcvi.pdfIn PDF document text
    • http://wexypay.icu/2015_chevy_tahoe_repair_manualoa84k.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/echo_srm_230_parts_diagramwnszx.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/how_much_does_tracfone_data_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_60105b36ea265.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasevofal.epizy.com/66525063660.pdfIn PDF document text
    • http://vufigenetusanu.epizy.com/gusano_barrenador_del_ganado.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/88913094221.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/64593526470.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/dwarf_fortress_workshop_layout.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_off0000f193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF193 5524 bytes
SHA-256: 1db97508df17bc3e4450f04f81db28018db7d2d5fd67bc4480c52516ed2fb7d8
font_01_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 11184 bytes
SHA-256: 95fdfb46cea47b8970d1e8989fd5345b1a4b85ce6f1cb2323e2751dd8cd79278

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