Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c5d51cad18231af…

MALICIOUS

PDF

83.0 KB Created: 2021-06-05 00:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 67f998cde3644f8ce6921c6137414bf6 SHA-1: 241ff141c6df7c975b8363656416ff13b009cb7a SHA-256: 9c5d51cad18231af2e692d3b7597ca971b2446b8805110b3f95cc57348f6c955
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm. The primary URL, 'https://nomylo.ru/pbw?utm_term=best+tier+3+marvel+future+fight+2020', indicates a potential phishing or scam lure related to game content. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the link-farming behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nomylo.ru/pbw?utm_term=best+tier+3+marvel+future+fight+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413703/normal_5fed2f63db19f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393916/normal_5fdff38d4a3f0.pdfIn PDF document text
    • https://pesipexis.weebly.com/uploads/1/3/4/3/134377561/motixigunin.pdfIn PDF document text
    • https://zexamaginususu.weebly.com/uploads/1/3/4/6/134686515/ec78e53009ba0.pdfIn PDF document text
    • https://vemulasi.weebly.com/uploads/1/3/4/5/134509822/torifaz-xofabifobo.pdfIn PDF document text
    • https://gowukamumikezaj.weebly.com/uploads/1/3/4/7/134769013/6877606.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444351/normal_60640fe814469.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4420905/normal_60b19cc18122d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368501/normal_60449f864c9dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403534/normal_6030188de30b1.pdfIn PDF document text
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/b68b9.pdfIn PDF document text
    • https://fofuxexofinob.weebly.com/uploads/1/3/4/7/134717506/dawugosolifefotilor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380674/normal_602e3d7763e74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_60316b7f719f6.pdfIn PDF document text
    • https://zepusarogetiki.weebly.com/uploads/1/3/4/6/134687077/7836639.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/e2bc350c-f63c-486c-aeab-0df2f7e895a7/17725286433.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/839623ff-3661-42b1-8016-88d8b9a57253/vurunexebusogopiwajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf464efe-a981-4383-8223-c44500dcf2e2/washing_machine_home_service_repair_qc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64a14b67-39cb-4a44-9684-7f83d5897f1f/panasonic_kx-dt333_bluetooth_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/420f3797-cca9-460f-842f-f3543cff5e63/27621249322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/921a987c-598f-483a-ab0b-c197729679fe/dell_t5500_workstation_light_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e335601c-763f-43f0-9aa6-bdc3dceac979/megozinasa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 3088 bytes
SHA-256: 791576a10c7500b372da8ef3287192998371d140270b646beeaf40d836bd9be4
font_01_sfnt_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 5728 bytes
SHA-256: 7148a5e518ddab71ef029353d67b626599bae056dcff682c1054d49f67ef516e
font_02_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 11416 bytes
SHA-256: 5f9a6f559805c2d171b87a022e011351040e87cee25b79463adbae62c1b60746
font_03_sfnt_off000126f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F9 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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