Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbeef446f42feadc…

MALICIOUS

PDF

109.9 KB Created: 2021-02-10 04:33:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0e26bb4f32fb85bb6efd74bf54715d5f SHA-1: 846d3c782a3c10ec5c2f07ea531083e9665ccb20 SHA-256: cbeef446f42feadc49be128307b8bcbc3b637caa5525202e09ebb7d0fc140e4f
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as document titles, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic further support that this document is designed to trick users into clicking malicious links, likely to download a second-stage payload.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bologen.ru/aws?utm_term=cb+insights+global+fintech+report+q3+2018 PDF link annotation
    • https://cdn.sqhk.co/fapiwejagiz/eXTLLhd/train_sim_world_2_roadmap_october.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/TOT7dC7/pemozeteduxe.pdfIn PDF document text
    • https://cdn.sqhk.co/bofilewidil/hf8jdW5/field_hockey_goalie_drills.pdfIn PDF document text
    • http://curvepreloved.com/hidden_objects_3d_diorama_puzzlesbmmdm.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/bOtViip/alpha_guns_mod_unlocked_apk.pdfIn PDF document text
    • https://gakewejodum.weebly.com/uploads/1/3/4/9/134902465/zutotegexol-dazegozegino.pdfIn PDF document text
    • https://likifovufuli.weebly.com/uploads/1/3/4/5/134588617/6007318.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/9415177.pdfIn PDF document text
    • https://cdn.sqhk.co/kisibijobu/pmFgfhc/tower_fortress_hack_apk_1._0_227.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/1gdhhie/polandball_not_safe_for_world_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/jhEwehc/sarkar_infinite_game_hack_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_5fda7459ddef0.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/jbTniht/2600._emu_apk_1._5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejebuta.rf.gd/descriptive_writing_sample_answer.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_off00016c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C4A 6132 bytes
SHA-256: 9f78f02c6a7efaf66f669f753936bfbf593ba2909466d8a84fb8e71abc63f78c
font_01_sfnt_off0001811d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1811D 12416 bytes
SHA-256: 2f2ae93ba71c88d13cce32d0eb63603b1eb8e087a9ca5692fc4946df473bdf84

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