Malicious PDF — malware analysis report

Static analysis result for SHA-256 7808cde5c0c2b9ab…

MALICIOUS

PDF

73.3 KB Created: 2021-01-08 09:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: af5a3784cce511b7659585db9e2de470 SHA-1: 76fdbd527f6aec27a335b40573b17ff87a5a2aa1 SHA-256: 7808cde5c0c2b9ab344806f4b5057b4ff254d13fc5792949fa7cb2757a0bd67a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://trafffi.ru/123?utm_term=quad+diamond+engagement+rings', which is likely a malicious domain used for traffic generation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafffi.ru/123?utm_term=quad+diamond+engagement+rings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446280/normal_5fdafc1b1df68.pdfIn PDF document text
    • https://sexewowoko.weebly.com/uploads/1/3/0/8/130873923/65537ca006e.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/3694220.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/071de63b-1bf6-41e7-9d11-b7f8683f1e0f/27611960222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18960c30-8649-45fe-a19d-6501a93b144c/power_quick_pot_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b87f7a-3358-48a7-bbb4-d8844da82605/89123470805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56ada78f-9fdd-4bb3-8719-3a5d9544e0bc/47607213177.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6cd488-8f5f-4a77-9fd8-3e9a2f627a8c/womens_witch_costume_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/54785604752.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/gifamufisorujikilos.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/adrenal_gland_ppt_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1310a9e-de48-4b94-88cc-8c71673f6dc9/what_is_an_objective_in_a_scene_11.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_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 5176 bytes
SHA-256: 0abdfeb5547a330578a6d770a4d1744e27c9f6d1330ad80cd90b41d7eec04ac0
font_01_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 11708 bytes
SHA-256: b2d6e318ff0044adc044851a3ee1ed5c3c3093cc9855073f1f198fc8b0aa5934

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