Malicious PDF — malware analysis report

Static analysis result for SHA-256 c359bdb6294e615f…

MALICIOUS

PDF

60.6 KB Created: 2020-12-15 12:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 556a5164eb7818172e9de273434c6384 SHA-1: 71a15c4746ff23832be1779dbc52d23272071426 SHA-256: c359bdb6294e615ffbcd64035f3f1076eaa1822a1a7e220912f0c8270b87b16e
244 Risk Score

Malware Insights

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

The PDF contains a significant number of links pointing to external resources, many of which are hosted on disposable domains and redirect to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=gattaca+movie+questions+biology In PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/neved.pdfIn PDF document text
    • https://fuxamuwilemodo.weebly.com/uploads/1/3/4/4/134478429/895d9.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/678a2b171.pdfIn PDF document text
    • https://wijejotuxaketuv.weebly.com/uploads/1/3/4/3/134338978/kogijepeb.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/majivokigade.pdfIn PDF document text
    • https://nuzepobijane.weebly.com/uploads/1/3/4/8/134885792/bobosirexujo_xulare_pukizadixom_birutijap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fc9445bb8c2f.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/b4b2b14d-fce7-449c-bc0b-d60b1d221eca/10086858132.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0805cd49dd12447321748/t/5fc2c28961e25426e192d425/1606599305387/62668876688.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59761084698658e7e32d0/t/5fd12737a6172a26709dd19a/1607542584537/mugusuwelijadufilo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf23a79c08c7f2b9dc110/1606218300957/muforal.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_off0000b15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB15A 5484 bytes
SHA-256: 9ededdf1c357ccdc971b9288eb11109514ecf6689c1899b491563fa2a88accde
font_01_sfnt_off0000c402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC402 9960 bytes
SHA-256: d440cbee58b0b3b581e6c7592cb3f575e41c5cd094a9b4916dd290a8189a62e8

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