Malicious PDF — malware analysis report

Static analysis result for SHA-256 d765085859319dd7…

MALICIOUS

PDF

75.5 KB Created: 2021-06-06 10:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 86cdf3c5946506078470d96e9028cfd0 SHA-1: b44e26295e83f21271b323d94e9f8be0321c8267 SHA-256: d765085859319dd79d171900933d1941f0e6af91a78d71829ceb981d2bfdeaea
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The presence of a specific search term related to game mods in one URL indicates a lure to attract users. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/pbw?utm_term=mini+militia+mod+apk+unlimited+health+ammo+and+nitro+download+2019 PDF link annotation
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/3041968.pdfIn PDF document text
    • https://jazexupojofon.weebly.com/uploads/1/3/1/4/131409098/rajepizasurarir_dimatev_nolep_xoxaleju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_60bb724843b1d.pdfIn PDF document text
    • https://zekulereloto.weebly.com/uploads/1/3/2/7/132710655/tumidotob_wimima_vodigod.pdfIn PDF document text
    • https://zelivetatop.weebly.com/uploads/1/3/0/8/130814581/8707680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462037/normal_604b7351a326a.pdfIn PDF document text
    • https://xijogokamu.weebly.com/uploads/1/3/4/7/134721509/suvitakot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_5fd65330b34b1.pdfIn PDF document text
    • https://veborejekeraleb.weebly.com/uploads/1/3/4/4/134480613/9039700.pdfIn PDF document text
    • https://ferovagadimi.weebly.com/uploads/1/3/2/6/132696304/78a97923fe7fd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_602d9ce9a4b52.pdfIn PDF document text
    • https://navanelesud.weebly.com/uploads/1/3/0/9/130969746/4156759.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/8b93c406-3f67-40f3-89f8-d801cca4c8a6/tatokosavilepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47b01e9-332e-4148-8b23-8bed5aea6d28/2006_sundance_optima_spa_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807f003c-bdcf-4c33-8c5a-56a308fa3c39/belutinizirebowiverubux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9340c34-fd14-4c74-b8ca-9a89b06f0725/lipagavijixewojofipad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61101e9b-7f52-465e-b0ad-4531a03ac0c8/gimavademokabijagavux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eef3aa03-5b58-4639-845d-2fa9e355ef9d/xazezetogu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39d165a2-06df-4fe1-9655-a7e4c928f827/34459962917.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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 5664 bytes
SHA-256: 15772392cf9d21625d1d4576bb0c23b6b6f7facf21421454d72221ead82cafc6
font_01_sfnt_off0000fb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB65 10764 bytes
SHA-256: b793d3756f8e44933e4f3a4b705d869d45377c63f4b31c4a982e0bffb359e6ec