Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b99b8140e206d9…

MALICIOUS

PDF

91.5 KB Created: 2021-03-02 21:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a2412bf22d52fc4e0b4b08268606ede4 SHA-1: 0334f24b21f97bebdecb9c655be46c18ade758a7 SHA-256: 23b99b8140e206d97295f96e8c0e6f6a3daadba22b483983e2134f9424654682
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to various domains, many of which are hosted on disposable or suspicious platforms. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO poisoning or to host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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/wb?keyword=how%20to%20strengthen%20your%20neck%20for%20wrestling PDF link annotation
    • http://timinome.getenjoyment.net/4888629405.pdfIn PDF document text
    • https://doxefifuz.weebly.com/uploads/1/3/0/9/130969363/wogipibixerifazupuvu.pdfIn PDF document text
    • https://tumozoredupoki.weebly.com/uploads/1/3/0/9/130969837/5bee205fa7aae.pdfIn PDF document text
    • https://nebowepef.weebly.com/uploads/1/3/4/4/134483035/8e741cc5b5.pdfIn PDF document text
    • https://cdn.sqhk.co/biluvetizom/hfgeyQl/nulazi.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/afjiLja/29257741900.pdfIn PDF document text
    • https://zolaverapudo.weebly.com/uploads/1/3/0/8/130874102/13d74fd18ba1e.pdfIn PDF document text
    • https://wamogipoko.weebly.com/uploads/1/3/0/7/130739383/tarabusakafijovuku.pdfIn PDF document text
    • https://jokinurelebuvet.weebly.com/uploads/1/3/1/8/131856462/miwuzokireb.pdfIn PDF document text
    • https://xironudobavus.weebly.com/uploads/1/3/4/4/134461104/vitisal_kivobiwowuvedir_girip.pdfIn PDF document text
    • https://cdn.sqhk.co/kimazibo/edxu4tp/blockchain_and_cryptocurrency_full_coursera_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vumamuv.myartsonline.com/bolens_21_inch_push_mower_wont_start.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/v1_guided_bus_timetable.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/90781241637.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/13709300605.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/44276416515.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_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 5152 bytes
SHA-256: a1402362645d8d97fdb856d162ae3ae80c9d8c325481bcb6bc3a5e36be936844
font_01_sfnt_off00013ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC6 11136 bytes
SHA-256: f43a79f6c52477b2511ab76d6209190389bc52fc484b829de10d461e94bf22d0

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