Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b84358624af7ee…

MALICIOUS

PDF

80.0 KB Created: 2021-06-06 21:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e772860c69506a6139884dcad66551b7 SHA-1: 7cee0cbc41f6d9c52ecc3b8eabfb5ea664b27eb6 SHA-256: c9b84358624af7ee2e951856db41f8b0b43f4f13325ea785a857d58380340997
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, 'https://pistant.ru/pbw?utm_term=how+to+solve+for+f%2528x%2529', suggests a lure related to academic or technical content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure points to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pistant.ru/pbw?utm_term=how+to+solve+for+f%2528x%2529
    • https://bowogemiris.weebly.com/uploads/1/3/4/3/134316512/7505403.pdf
    • https://cdn-cms.f-static.net/uploads/4384301/normal_60685626e8162.pdf
    • https://cdn-cms.f-static.net/uploads/4426697/normal_6040116f0d61f.pdf
    • https://fizobadajavene.weebly.com/uploads/1/3/4/4/134492874/c10527.pdf
    • https://cdn-cms.f-static.net/uploads/4392209/normal_60b881db9ef36.pdf
    • https://buxijabis.weebly.com/uploads/1/3/5/3/135329720/30c6ed0b7f67.pdf
    • https://cdn-cms.f-static.net/uploads/4445340/normal_60bd0530016c8.pdf
    • https://cdn-cms.f-static.net/uploads/4393752/normal_60b954efe7ff2.pdf
    • https://datuzela.weebly.com/uploads/1/3/4/1/134109276/gesunazudejezo.pdf
    • https://momitoxen.weebly.com/uploads/1/3/7/5/137514133/vadaloxevu.pdf
    • https://pozuzabo.weebly.com/uploads/1/3/4/4/134432083/vojetomepijela.pdf
    • https://lawukexudemodu.weebly.com/uploads/1/3/4/0/134041757/tubodogometagokuwin.pdf
    • https://cdn-cms.f-static.net/uploads/4471081/normal_6067938fd8dc8.pdf
    • https://bazeneta.weebly.com/uploads/1/3/0/8/130813787/02964b97.pdf
    • https://rekinijibir.weebly.com/uploads/1/3/2/3/132302710/9276266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f44c6799-ed3d-4c1a-973d-97ba2be1d62f/how_to_study_for_microbiology_medical_school_reddit.pdf
    • https://uploads.strikinglycdn.com/files/8df190d1-f59e-43c0-b7c7-fb370982140d/domivoveximus.pdf
    • https://uploads.strikinglycdn.com/files/8c516cc7-19ee-4bd1-ad0b-e0a7a5b55995/rirobuxojogutawajap.pdf
    • https://uploads.strikinglycdn.com/files/7e07d25a-651b-4643-839b-c268b0dd7a91/icd_9_code_for_sepsis_uti.pdf
    • https://uploads.strikinglycdn.com/files/4ca15960-b46b-4fb5-a722-6a45ef8988c0/best_institute_for_ethical_hacking_course_in_india.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e970.bin
9b06f70fd75bc52b2ab70a54cbfd1dac07344d6af69fae4a3a42c1bd9fbd5042
pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 4520 bytes
font_01_sfnt_off0000f902.bin
33ad96a8e903ad7248f302e83209cffcfd294d08b7c3f5adc0623d18dd63998a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 13540 bytes
font_02_sfnt_off00012353.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 4324 bytes