Malicious PDF — malware analysis report

Static analysis result for SHA-256 10573e3985e0b186…

MALICIOUS

PDF

83.7 KB Created: 2021-03-07 16:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ab97d73d81816473758f0e667482ae9 SHA-1: ff28686f0c8f7a51b9bcc1be7e03c78731ac7a65 SHA-256: 10573e3985e0b1864aa1118ac0a7072a5a40637884a93c4d5682b9430825367a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing trojan.

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://nipisod.ru/strik?utm_term=livros+em+ingles+para+iniciantes+kindle
    • https://cdn-cms.f-static.net/uploads/4461505/normal_600dba2eb77c2.pdf
    • http://firstflirts.site/zifumolaleripubabbo.pdf
    • http://xasawidujilade.iblogger.org/gabuzafajavividifedofub.pdf
    • http://itfamily.pro/metodologia_dela_investigacion_cientifica_carrasco_diaznqe1q.pdf
    • http://arboozfilm.com/bimupujivewunopf24jm.pdf
    • https://static.s123-cdn-static.com/uploads/4465688/normal_5ff3b2aedac58.pdf
    • http://artrosil.xyz/thetford_c400_cassette_toilet_seal_replacementzcxy7.pdf
    • https://cdn-cms.f-static.net/uploads/4481170/normal_602a1726989bf.pdf
    • https://cdn-cms.f-static.net/uploads/4411918/normal_603e00e935d96.pdf
    • http://mailedflkf.site/black_and_decker_20v_lithium_battery_charger_flashing_greenpk7ez.pdf
    • https://cdn-cms.f-static.net/uploads/4370074/normal_601231cb6d2f0.pdf
    • http://zemojuvasu.iblogger.org/how_to_clean_the_bissell_proheat_2x_revolution.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nopadutotufa.epizy.com/logo_design_using_company_name.pdf
    • https://s3.amazonaws.com/wazotojemov/xasetukomofata.pdf
    • http://tekubone.epizy.com/balupu_telugu_movie_songs_free_320kbps.pdf
    • https://s3.amazonaws.com/xakusineba/rewef.pdf
    • http://winupenelipumo.epizy.com/hindu_wedding_card_templates_online.pdf
    • https://s3.amazonaws.com/limepusotanal/23935254487.pdf
    • https://s3.amazonaws.com/tarajix/lutibedo.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_off00010650.bin
db72d39ed644dc5f2813a757a762b9301bc97099e21a0578e16864895c71eccb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 5456 bytes
font_01_sfnt_off000118d1.bin
6888c5869fe3ba9efbaddf1345ad6b2fa803ecd11c3a15b70028b462c8c0a92c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 12552 bytes

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