Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4af19e7514977d…

MALICIOUS

PDF

75.9 KB Created: 2021-04-19 08:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cfcb507ee5814e9d182fa257f28da35c SHA-1: 2251b10b07b95bf8e17f8e3dc63bc1c3059d6ddd SHA-256: 7b4af19e7514977dc1a64e888d10eddc6859d20d21a204b49c9489ddc4c0482e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=la+hija+del+sastre+english+pdf PDF link annotation
    • http://xplaintome.ru/insider_reporting_osc4t5xu.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/OJgeghc/resowodibawawono.pdfIn PDF document text
    • http://torchland.xyz/lords_mobile_colosseum_guide_2017fpvcj.pdfIn PDF document text
    • http://formverifiedbadge.com/tipos_de_mapas_mentales_y_ejemplosvidbj.pdfIn PDF document text
    • http://specialsale.info/ejemplo_de_bosquejo_de_investigaciondagsb.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/gMshihh/vinurojategux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486535/normal_5ff65016bcacc.pdfIn PDF document text
    • http://womans30planet.com/kujosoni4rsvc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_6058692c77c9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452193/normal_603ffc1feb4de.pdfIn PDF document text
    • http://iranianvc.com/finders_keepers_losers_weepers_song_lyricsv74u2.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/temanupevopoxobime0mh8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408330/normal_602c6feecc00c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453747/normal_5fcba0724269e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483623/normal_605b1bdd6f5ff.pdfIn PDF document text
    • https://cdn.sqhk.co/rexixugepir/YsI4icF/kulajejari.pdfIn PDF document text
    • http://soinjaga.ru/how_to_connect_ipega_controller_to_iphonekhgzn.pdfIn PDF document text
    • http://123dutch.com/the_spare_room_helen_garner_book_reviewen8yr.pdfIn PDF document text
    • http://kvrovk.xyz/6_core_values_of_social_work_explained0h5hy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450624/normal_5fff96abc5087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A6 5320 bytes
SHA-256: 30e8761fe67d76477b2f3234fcf4c20c94865332e95390f294a4adb1275596da
font_01_sfnt_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 11284 bytes
SHA-256: e62fbbbe6d0e8be2ed85928cc0363c51e3583fdd2c1c9b1a9ccf017775d816f6
font_02_sfnt_off00010dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBD 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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