Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a144ae5c9ec47c…

MALICIOUS

PDF

84.0 KB Created: 2021-04-01 19:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d562839af53933a38d867bf81cd5b254 SHA-1: 744b9628c6581128095e37e02c41ea28cc69d854 SHA-256: b1a144ae5c9ec47c9353525f003714984948f11442c35178ff9d22794f458ddc
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain ('dugedepap.ru') which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document is part of a network of disposable sites, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/award?keyword=tactics+for+listening+expanding+answer+key+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475571/normal_5ffd5ef2768d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_5fd128127f986.pdfIn PDF document text
    • http://prizinsta365.site/free_printable_cause_and_effect_worksheets_kindergarteny76y5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379849/normal_60063a2bdf15d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412593/normal_60395ea04e9ea.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/buell_1125r_performance_specshffgq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_60463400314f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450502/normal_60551bb781578.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/ggirrEC/sunigisuxesewas.pdfIn PDF document text
    • https://cdn.sqhk.co/jobiwokojo/egjjcps/35390747606.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxegaxujifo/f9gfhjm/xozerimo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_3dc80f9224c3490c879b8f465be82841.pdf?index=trueIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_45f4a2d37a9545c1b8f33ed9d9e150fb.pdf?index=trueIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_2f33a20068e843a7958565b98de99423.pdf?index=trueIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_3854d0d983de4f2e8215ad01ce8c025c.pdf?index=trueIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_f893a3cb039942b683e4c91877755191.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_c83ccebc3d4249ce965d1f0a6ef6d98c.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 5596 bytes
SHA-256: a7c9e126f24b150e66ea1ef7088b8742de717f00febb5d57fa135aa60c110c12
font_01_sfnt_off0000fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA80 21364 bytes
SHA-256: 43f7bb6c739676df05373aa299e5e84bf93a6f4fa389c4f6b3f000691594c000
font_02_sfnt_off00012bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCE 16080 bytes
SHA-256: 56034361f66b2cbb672cdd79591637171ffea75261b7d95bb52ed06155cd5fbd

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