Malicious PDF — malware analysis report

Static analysis result for SHA-256 562136613bd23102…

MALICIOUS

PDF

74.7 KB Created: 2021-06-11 10:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1e28854dcff246be5403d2365249df7 SHA-1: d02cb497d65872b0e86713cd1f5147d52e949494 SHA-256: 562136613bd231025670403ec0b2bf4e0b0371956a4778f8c5a144132c3816be
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on a link to 'allytemp.ru' that is disguised as a game download. This URL, combined with heuristics indicating a link farm on disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://allytemp.ru/pbw?utm_term=gba+games+download+pokemon+x+and+y
    • https://cdn-cms.f-static.net/uploads/4414175/normal_600f1124877ac.pdf
    • https://cdn-cms.f-static.net/uploads/4452607/normal_602b63e233566.pdf
    • https://static.s123-cdn-static.com/uploads/4465400/normal_5fce90429e491.pdf
    • https://static.s123-cdn-static.com/uploads/4469828/normal_60062ab6d85e4.pdf
    • https://static.s123-cdn-static.com/uploads/4403537/normal_5ff8bb21dfe34.pdf
    • https://cdn-cms.f-static.net/uploads/4496225/normal_60240c7c5121c.pdf
    • https://cdn-cms.f-static.net/uploads/4456166/normal_60474e0d91033.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wasosux.pbworks.com/f/ruzotenedamijalunudibi.pdf
    • http://podixarutib.pbworks.com/f/plague_inc_apk_full_unlocked_download.pdf
    • http://milatufed.pbworks.com/w/file/fetch/144989595/boom_beach_hacks.pdf
    • https://uploads.strikinglycdn.com/files/c21c4d17-096f-4bd8-a431-f5a2886cfd7c/junior_graphic_designer_jobs_chicago.pdf
    • https://uploads.strikinglycdn.com/files/c7c1df0e-a09a-4f58-9b12-4a142319a392/unit_4_lesson_1_cumulative_practice_problems_answer_key.pdf
    • http://rifejikomige.pbworks.com/w/file/fetch/145026600/online_school_management_system_project.pdf
    • https://uploads.strikinglycdn.com/files/a2d77fb8-079e-4834-8846-5bb3727babc1/vimijezuzoxufuxadav.pdf
    • http://zikupuzajix.pbworks.com/f/play_desi_tv_app_download.pdf
    • http://watusuxipidu.pbworks.com/w/file/fetch/144560763/dabefasuzipaxeletisamikol.pdf
    • http://sowenux.pbworks.com/f/the_royal_order_of_adjectives_examples.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d451.bin
dedc6737ecfd983bbac196ffdfbd692dbcd438c9dd53e1ebf149d29e2392d566		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD451 5680 bytes
font_01_sfnt_off0000e7ab.bin
1b633d4c3b40fcf4686e9706e020f85d15dae8880f985a387f0ca43ccc664a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 3648 bytes
font_02_sfnt_off0000f4f8.bin
2320d92020b07e8913126c3428ee28a6e2a0a8dcfcda42f162ff43dd7b6ab937		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 11352 bytes

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