Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96b73cc43ef6e72…

MALICIOUS

PDF

85.2 KB Created: 2021-04-08 13:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d03d1eaec5d29546bd9ed895764621bb SHA-1: 623f2cd32aeb7c24783867a939d904dadbbffcff SHA-256: b96b73cc43ef6e728e1284e48c95a26945f8c0232b01ede3a0df34e1d050d224
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('seumenha.ru') that is likely part of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to use disposable hosting for distributing malicious content. The ML classifier and ClamAV detection strongly suggest malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=spalding+54+portable+basketball+system+adjustable+hoop
    • http://xatakafigudu.getenjoyment.net/marguerite_duras_hiroshima_mon_amour.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://hq-cleartv.info/56014067016bfdk7.pdf
    • https://cdn-cms.f-static.net/uploads/4367281/normal_6069f5db82e5d.pdf
    • http://ramubananene.iblogger.org/cereus_cactus_information_in_marathi.pdf
    • https://cdn.sqhk.co/xeviremal/hjgf9XO/91264434422.pdf
    • http://vaxiliwu.medianewsonline.com/boviwokiratake.pdf
    • http://1pokypki.website/ibn_kathir_tafsir_surah_yusuf0fkh3.pdf
    • http://greatmasters.biz/singer_brilliance_error_code_c3pqrs2.pdf
    • https://static.s123-cdn-static.com/uploads/4481156/normal_5ff5e7b65cda6.pdf
    • http://gipogup.sportsontheweb.net/xapajumeduwapadefu.pdf
    • https://cdn.sqhk.co/pefisemise/ciayjgD/the_mummy_returns_full_movie_online_english.pdf
    • https://cdn.sqhk.co/gujuvizaja/aTjg5ic/snake_vs_block_play_online_for_free.pdf
    • http://budokudepa.scienceontheweb.net/how_to_use_iphone_11_camera_settings.pdf
    • http://zeropium.com/17124228267gpv9v.pdf
    • https://cdn.sqhk.co/zalivelo/he5qjfz/92592118226.pdf
    • http://jovepodixowofow.mygamesonline.org/52683877668.pdf
    • http://tupaxeguna.scienceontheweb.net/wat_is_complex_trauma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fepaxediv.rf.gd/71357818349.pdf
    • http://mafekebokidodat.rf.gd/wifobut.pdf
    • http://zijipowatik.epizy.com/fijikobejuvirifidujip.pdf
    • http://luzarokoxi.epizy.com/13309606546.pdf
    • http://wutesejib.onlinewebshop.net/kaworadonovedevexunugale.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_off00010ed9.bin
50c8de398d53129a49f7b66a6d825c984561df147b185049e270267b4476b4a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 6068 bytes
font_01_sfnt_off00012365.bin
7ad468cd843fa2d33968f6d37445237fb64a6cc08aafebb5dfcaa03225e7d7c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12365 10328 bytes

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