Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91ea4525087279e…

MALICIOUS

PDF

68.1 KB Created: 2021-06-04 22:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2f5f5274993ded1eaeb65967160006cc SHA-1: 5b527a9d5eaf96d1a74fd4743a77bce2b30a3834 SHA-256: e91ea4525087279e5080cc0c93fa15b8a23143bd9f2c39b4c3f078b957c0230c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest malicious intent, likely for phishing or malware distribution. The ClamAV detection and ML classifier further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/pbw?utm_term=6+times+tables+up+to+10000 PDF link annotation
    • https://dugesadodi.weebly.com/uploads/1/3/1/1/131164249/damomo-tonunaj-modunorexivinab-gimukajevugir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452173/normal_5feaed2a738e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392862/normal_5fd790abc0fa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496404/normal_605b771a4d69a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_5fe9ac2f3a935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488822/normal_605538fdc2753.pdfIn PDF document text
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/jaruxewazote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_60b8a0c256741.pdfIn PDF document text
    • https://mejofeva.weebly.com/uploads/1/3/2/6/132681501/2301773.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380082/normal_60468e857b270.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/493a5c53-ba83-4146-a5da-b80b34ae1f19/87622543623.pdfIn PDF document text
    • http://tasonupopam.pbworks.com/w/file/fetch/144616092/best_free_procreate_brushes_for_lineart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd10d96b-e48d-4b46-b329-7417d094436d/power_pro_super_slick_braid_review.pdfIn PDF document text
    • http://vogituvu.pbworks.com/f/gaxisuwamefumawuzovipu.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/how_to_fill_out_a_business_tangible_personal_property_return.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144526110/in_spite_of_despite_although.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/best_mcq_book_for_neet_biology.pdfIn PDF document text
    • http://sisagexal.pbworks.com/w/file/fetch/144561483/80055688473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1451f39-b6bb-464e-8a2e-761ee7c43f8c/xijopopafojosavunumibopi.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_off0000ce2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2C 5264 bytes
SHA-256: 00a9c848a20ecd0683292e110a392b5d5ef377f868082ecf9be2a8a9b9a26891
font_01_sfnt_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 10408 bytes
SHA-256: ef6563e78d9effc8da477416f4acb164b11a5866cc4f5b6499f4103861d67d4a

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