Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b70512b6e829796…

MALICIOUS

PDF

86.2 KB Created: 2021-03-29 23:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3554fe563505b75280df1dd709c0c6b SHA-1: a784ba6f4f0460dee2a7e0b11a5d303dd0b311f6 SHA-256: 6b70512b6e82979642844dfa6b6d9ccbc344ab10d30c425a8194362a6ddfafe5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one to 'pelibifir.ru', which is likely part of a link farm designed to improve search engine rankings for deceptive content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=ap+bio+chapter+15+reading+guide+answers+pdf
    • https://cdn.sqhk.co/gujowaxexag/d5hjAgi/samsung_electronics_philippines_corporation_email_address.pdf
    • https://cdn.sqhk.co/wazuzofi/o2TZicP/nijoladogufomev.pdf
    • https://cdn.sqhk.co/pajazidif/YwJK7jc/94701597770.pdf
    • http://mylevel.store/how_to_check_2001_ford_f150_transmission_fluiduvors.pdf
    • https://vobilazi.weebly.com/uploads/1/3/5/3/135300702/mumikivezugidafidasi.pdf
    • http://kino-vezde.ru/all_coordinate_geometry_formulasfac1y.pdf
    • https://wutiduxa.weebly.com/uploads/1/3/5/3/135300785/8fc7dbec2d.pdf
    • http://bipiraxas.iblogger.org/vukap.pdf
    • https://dijibelusubif.weebly.com/uploads/1/3/4/8/134871127/fenikufoxi_borumezez_pajemubutogub.pdf
    • http://form-copyrightservices.com/nj_transit_bus_164_holiday_schedule_163avzin.pdf
    • https://cdn.sqhk.co/wefekoferu/6qhhid8/41795408861.pdf
    • http://vugatejomib.22web.org/cido_sulfhdrico_formula_quimica.pdf
    • https://cdn.sqhk.co/jinubodilev/ieEjdgi/jetaudio_music_player_plus_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/murudute/53842932985.pdf
    • https://uploads.strikinglycdn.com/files/1f282a7c-6e99-4ae1-b83c-df865693df30/xefoxo.pdf
    • http://rapuzezu.epizy.com/bartter_syndrome_treatment.pdf
    • https://uploads.strikinglycdn.com/files/4f5f0e40-6819-4aaf-ad80-7ed796c4822b/diagrama_de_fases_binario_solido-liquido.pdf
    • https://s3.amazonaws.com/nitirew/ruvezos.pdf
    • http://palulofegag.rf.gd/56957807213.pdf
    • http://katanitape.rf.gd/70154286059.pdf
    • https://uploads.strikinglycdn.com/files/498d96db-65f0-4905-ad2f-02a8f450b3e3/why_wont_my_08_dodge_avenger_start.pdf
    • https://s3.amazonaws.com/jozetej/java_jre_9_64_bit.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa21.bin
0e25fb77aabf47103f05cc72edb0abd80424938accc053a7c9c8f7a26fda04cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 5780 bytes
font_01_sfnt_off00010ddb.bin
bdf7fccac172617d86bb51bbd421ac8ecc1b4185bb7f1d27ea2dffbcd69faade		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDB 11392 bytes
font_02_sfnt_off000134ee.bin
d1d22c361f20a6bc00128feb793d398823fc63910e017aec1b2fc93c7dbb2f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 16248 bytes

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