Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d506232332c746…

MALICIOUS

PDF

81.3 KB Created: 2021-05-09 04:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bd779c08722bb0f708fc134b3be2f335 SHA-1: 92b8b8f4ae5365bdd060ef49feda29c7012ecd58 SHA-256: 71d506232332c746e8f4c80f9d7e5b95a49fb5bb5d71c845fe4a3f17a5085bd2
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://dugedepap.ru/strik?utm_term=how+to+get+in+a+tree+stand PDF link annotation
    • https://kijujula.weebly.com/uploads/1/3/4/7/134756294/2b1b7399464150e.pdfIn PDF document text
    • https://cdn.sqhk.co/xepubijiko/1jghb6n/wekefepudonedemox.pdfIn PDF document text
    • http://zevupixikug.mywebcommunity.org/how_do_i_fix_my_verizon_red_globe_router.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/hjdjeCL/brick_crushing_machine_hire.pdfIn PDF document text
    • http://teguruta.medianewsonline.com/86143625026.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/what_happened_to_mary_rowlandson.pdfIn PDF document text
    • http://memisada.mygamesonline.org/zuvovinof.pdfIn PDF document text
    • http://dokukuke.mypressonline.com/asvab_for_dummies_2020_19.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/puzedun_vikadinimukele_xukidaridixogo.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/20_feet_container_dimensions.pdfIn PDF document text
    • https://cdn.sqhk.co/nojebimit/xjh3jcl/84402107642.pdfIn PDF document text
    • https://lejalapu.weebly.com/uploads/1/3/0/8/130874477/gosolof.pdfIn PDF document text
    • http://teguruta.medianewsonline.com/logawo.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/corazon_espinado_tab.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/agile_project_management_with_scrum_roman_pichler.pdfIn PDF document text
    • https://cdn.sqhk.co/miwizawi/ieiiojf/car_games_for_boy_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lajagika/QAjbhd7/67989465315.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/65311a1d-fdd1-439c-a88b-85f8ee8ba0a0/rawls_a_theory_of_justice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2086ecaf-bc29-4046-84a2-12efe08c6644/spoken_english_school_near_me.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_off0000ff22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF22 5016 bytes
SHA-256: 91b6e0c47dad70f0241f55ffcfce8fc9015e1506904d997cffb587eac56cdc67
font_01_sfnt_off00011052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11052 11424 bytes
SHA-256: 862ee2fe1eaf50f83037500378fc15de94d8ca4f56f67bf8ba00fffa5556bdc2

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