Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7cbf5be6ad98d8…

MALICIOUS

PDF

78.3 KB Created: 2021-03-25 04:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c57fab5811252a28eeabaa50c6f2f4ce SHA-1: 73c4f4929aa4772f684ad906c567d9a8d6196138 SHA-256: 7e7cbf5be6ad98d8ce5bb1b25ec040a8f5994005effacc9fe0883559e782154f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary suspicious URL being `https://zajinet.ru/strik?utm_term=link%2527s+awakening+turtle+rock`. This behavior, combined with ClamAV detection and ML classification flagging it as malicious, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the structure indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=link%2527s+awakening+turtle+rock
    • https://cdn-cms.f-static.net/uploads/4450340/normal_605421a9d288f.pdf
    • https://cdn-cms.f-static.net/uploads/4378599/normal_6044cba9d7bba.pdf
    • https://cdn-cms.f-static.net/uploads/4417992/normal_605a16c1e604b.pdf
    • https://kofoxutekibefa.weebly.com/uploads/1/3/1/4/131454286/a9bf3572ec1.pdf
    • https://cdn.sqhk.co/rosojolude/kkNhfQm/kaepernick_football_hall_of_fame.pdf
    • https://cdn.sqhk.co/neratimo/aueoief/wagirajegugetiz.pdf
    • https://cdn-cms.f-static.net/uploads/4410020/normal_5fd63bb36a753.pdf
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/a31b0bd7505d0.pdf
    • https://static.s123-cdn-static.com/uploads/4474720/normal_5fec2a35435e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wovibojo.onlinewebshop.net/why_do_babies_get_fussy_during_leaps.pdf
    • http://jimomurapujivo.onlinewebshop.net/cobra_148_gtl_channel_mods.pdf
    • https://s3.amazonaws.com/zonebon/patikazadubipurof.pdf
    • https://s3.amazonaws.com/rizezobabub/alienista_livro.pdf
    • http://tigagatu.atwebpages.com/skyrim_change_load_order_vortex.pdf
    • https://s3.amazonaws.com/vesubodufisi/70035788707.pdf
    • https://s3.amazonaws.com/tabobujimo/kahoot_bots_that_answer_questions.pdf
    • https://s3.amazonaws.com/nakevoja/kebupokiwod.pdf
    • https://s3.amazonaws.com/pisik/how_to_put_car_seat_in_chicco_cortina_stroller.pdf
    • https://s3.amazonaws.com/sigobija/funny_birthday_card_template_free_printable.pdf
    • https://s3.amazonaws.com/lanubili/capriform_venture_sdn_bhd.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_off0000f77d.bin
92c6068a5f3333a1695419e35dd2936ac5110a874deea796103cde4139d99371		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 5096 bytes
font_01_sfnt_off0001090d.bin
954baf1023ae513420173571849ac04034bb389f758560c28191acc509cd079f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 10176 bytes

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