Malicious PDF — malware analysis report

Static analysis result for SHA-256 532d5cade7fc308b…

MALICIOUS

PDF

73.8 KB Created: 2021-02-21 19:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d06c806bdebe8e9d8eddb7d25704476 SHA-1: d9c472369dc1973e6d46d8ff8122429d4891c8d2 SHA-256: 532d5cade7fc308b12fafde95ea806a3c971e4be89c0073b56810f346d834e27
186 Risk Score

Malware Insights

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

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 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://druttle.ru/123?utm_term=electric+ford+mustang+mach+e+0+60 PDF link annotation
    • https://rivezotuxo.weebly.com/uploads/1/3/5/3/135337491/761f41afdbb8f0.pdfIn PDF document text
    • https://vesevowix.weebly.com/uploads/1/3/3/9/133987154/6722808.pdfIn PDF document text
    • https://cdn.sqhk.co/vemunaxudug/hhgdv7V/assoluto_racing_gear_ratio.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/hrggBic/kawenuxebek.pdfIn PDF document text
    • http://bowanizi.22web.org/apricot_blossom_vector_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/UACjghb/64499876737.pdfIn PDF document text
    • https://rudixesawemes.weebly.com/uploads/1/3/1/1/131163949/2660001.pdfIn PDF document text
    • http://shoop-ff.ru/geometry_congruence_proofs_worksheetclcvi.pdfIn PDF document text
    • https://cdn.sqhk.co/tosilura/pVPigFz/bowugigixudupejixe.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/8081166.pdfIn PDF document text
    • https://rinulokol.weebly.com/uploads/1/3/4/8/134868038/c8ac8200534087.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwozigef/aPhf5d4/25836555282.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/hfhekic/36453178841.pdfIn PDF document text
    • https://cdn.sqhk.co/sivunukiwe/Bhgjexj/snakes_and_ladders_ludo_king.pdfIn PDF document text
    • http://bufizuz.22web.org/gmat_official_guide_2017_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mafonoxerinomif.epizy.com/escape_from_tarkov_key_guide_2019.pdfIn PDF document text
    • http://sefibonep.rf.gd/anime_characters_birthdays_on_january_21.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_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 5688 bytes
SHA-256: 804174fedde3976950851581570b65fec854d85ea4af81f583a4db3b5a9139d7
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 11008 bytes
SHA-256: 8f4f217c3046b7145a4e02dd78e10e1b33ee72c562248c2a41ddb61257c20df8

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