Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87696be50cb7104…

MALICIOUS

PDF

80.8 KB Created: 2021-06-07 05:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b45dabeeac33d2c7e87d34588ea4a977 SHA-1: 049262b1e884146e1c6eeca86f2bddb0c197b258 SHA-256: a87696be50cb71049b7819ac0dd55d6efb2fdde6e7b07a3a686dd843fb95b7f8
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, one of which points to a domain associated with phishing and link farming. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'painting techniques pdf download', which is likely a pretext for a phishing or scam operation.

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://ketchas.ru/pbw?utm_term=palette+knife+painting+techniques+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371258/normal_60253b536dbaf.pdfIn PDF document text
    • https://xovokemopozok.weebly.com/uploads/1/3/4/5/134579322/zomuvewufavo-suxizufomasaj-balodigedo-vagoditavawe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5ff4d062985ce.pdfIn PDF document text
    • https://sejimewopokotas.weebly.com/uploads/1/3/5/3/135350214/5c64dd22d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405443/normal_6024421ed3c3a.pdfIn PDF document text
    • https://wizemeleg.weebly.com/uploads/1/3/4/3/134307012/dovesuvoxave.pdfIn PDF document text
    • https://gevexewu.weebly.com/uploads/1/3/4/0/134018209/9879424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6044bd2c72947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bofamawetodo.pbworks.com/f/critique_of_everyday_life_volume_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ef424d5-f625-442e-9e86-6a8bc2e27217/analog_and_digital_circuit_design_tutorial.pdfIn PDF document text
    • http://pukagij.pbworks.com/w/file/fetch/144467718/ketekoki.pdfIn PDF document text
    • http://zixereves.pbworks.com/w/file/fetch/144539079/sisexelavumejebazow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342d5cf7-1777-429d-8663-e27757bff125/research_proposal_sample_in_educationpdf.pdfIn PDF document text
    • http://giwupiraride.pbworks.com/w/file/fetch/144666090/zowipebexune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a330ed-cb29-4749-b0a6-2907eaf76729/subway_surfers_hileleri_nasl_yaplr.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a963a8d5-992c-4c08-9ae8-296388dcafe5/how_to_make_arduino_projects_permanent.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_off0000f007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF007 5484 bytes
SHA-256: b6b63bd3b50394887599defc74a99f0cb9ae6f47ffa6c56c344836cff9f238eb
font_01_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 10864 bytes
SHA-256: 2574486dfdea5e7910bacccc0fad7c5419e2825069f337b7080f02aa641e3bc9
font_02_sfnt_off000127c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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