Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8f8dd8353ec92c…

MALICIOUS

PDF

72.4 KB Created: 2021-03-17 08:20:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 4944f9512a2c819f62f35c9416e2fda3 SHA-1: 5d624cb619bcd00cb42351e94844af466c3c6479 SHA-256: 2c8f8dd8353ec92c8566f6a9b2356d1976d2e6e28b93e66afde38be9489867a7
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, and is flagged by heuristics as a link farm and by ML classifiers as malicious. The presence of a link to 'mezovuduw.ru' with a keyword suggesting a tutorial indicates a lure to disguise malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution.

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://mezovuduw.ru/award?keyword=java+data+structures+and+algorithms+tutorial+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379029/normal_5ff5026c632bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_602ad187e1539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_5fdc42b8192be.pdfIn PDF document text
    • https://vopesowe.weebly.com/uploads/1/3/4/6/134638419/9569584.pdfIn PDF document text
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/puxaxap.pdfIn PDF document text
    • http://hookup153.space/what_does_the_child_say_in_mandalorianzt01i.pdfIn PDF document text
    • http://sallely.xyz/how_to_lose_5_pounds_fast_in_a_daygboe8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_5fe97039491fb.pdfIn PDF document text
    • https://cdn.sqhk.co/nadovexum/jEhaghj/13255064724.pdfIn PDF document text
    • http://tiktokfrance.fun/white_mountain_electric_ice_cream_maker_reviewsftl3a.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/hhdieif/dewaja.pdfIn PDF document text
    • https://digutejuwunapon.weebly.com/uploads/1/3/5/3/135325267/xixuvudivo_losijemanun_bulodelopejeje_tifasilovarile.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392210/normal_5fe58d4a64ebf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367674/normal_5fef6b2ad50d5.pdfIn PDF document text
    • https://cdn.sqhk.co/tefaxobaf/icNidic/grid_autosport_apk_1._6._1rc2_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lomogas/price_of_roland_piano_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/what_is_the_normal_oxygen_level_for_someone_with_emphysema.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/9741727617.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/komobabiwifelito.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/bass_guitar_lesson_for_beginners.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_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 5620 bytes
SHA-256: ead690573c6ad13c1810eef28a19a67a1e4f38da4f4a2482451d7645c5cb5698
font_01_sfnt_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 10664 bytes
SHA-256: 863cf372fb1113f26e0b20dc2ef32be327024a2673a534a47920c43f8865463c

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