Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fdfdc16f065951…

MALICIOUS

PDF

74.9 KB Created: 2021-04-01 00:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ef74de2ef10f60e432c57960785312a SHA-1: 5253e0160818ea2c95195ebeafad705a34146490 SHA-256: 94fdfdc16f065951f45ee628bb8ab222594f625ceafd6dd5ac4766a5f7101833
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one prominent URL being `https://baarspo.ru/wix?keyword=sorry+for+inconvenience+it+may+cause`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` suggests the PDF is part of a link farm on disposable hosting, further supporting a malicious purpose. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=sorry+for+inconvenience+it+may+cause
    • https://static.s123-cdn-static.com/uploads/4496584/normal_5feff02d29c62.pdf
    • https://cdn-cms.f-static.net/uploads/4445882/normal_5fd9f50acb5a2.pdf
    • http://pitikudefojeken.getenjoyment.net/how_to_change_belt_on_oreck_xl21.pdf
    • https://static.s123-cdn-static.com/uploads/4373502/normal_5ff338f2a6fdb.pdf
    • https://static.s123-cdn-static.com/uploads/4424364/normal_5ff53ad69c06a.pdf
    • http://haustova.com/50046443502yexhn.pdf
    • https://cdn.sqhk.co/gasawivu/VxnGjak/44093698188.pdf
    • http://pubgmobiie.com/necchi_sewing_machine_3537ii3w2.pdf
    • https://cdn.sqhk.co/benibavagoge/eEgiigS/88575561761.pdf
    • https://cdn.sqhk.co/ropikenetu/hiAijHM/hd_wallpapers_for_macbook_pro_15_retina.pdf
    • http://pasendapp.online/upsc_2016_answer_key_paper_1hupwh.pdf
    • https://cdn.sqhk.co/liwewajawab/hgjjeOX/3346890412.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wivipazipe.rf.gd/saga_dulces_mentiras_amargas_verdades_gratis.pdf
    • http://davojuke.epizy.com/12689276108.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/lakitunigiwaluridejapanu.pdf
    • https://s3.amazonaws.com/jajuzasalikirut/jevute.pdf
    • https://s3.amazonaws.com/bugutaj/96299050800.pdf
    • http://sujomux.rf.gd/85097506683.pdf
    • http://dupepoge.onlinewebshop.net/tisawowatari.pdf
    • http://jajunoz.rf.gd/spoonful_of_sugar_piano_sheet_music_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e669.bin
6c0224c69b5c16d4f76799cdb5eef95672d4edf8edf0c4d2d54773212580f635		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE669 5260 bytes
font_01_sfnt_off0000f846.bin
283fbbe69e27669c5b06402474d55fcd7c9c790b5dc82bc4e1f56c21711c6b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 11068 bytes

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