Malicious PDF — malware analysis report

Static analysis result for SHA-256 5550b8383484a97a…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 00:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed97f3e4b46726412ba17ccb16982357 SHA-1: ef77798fbd53778c806bb8bd47e9393cf1d4c248 SHA-256: 5550b8383484a97ab084c3704ecb8350086b3a96dd9ca1ea9034786d6c6bd683
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to funnel traffic to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crewmak.ru/uplcv?utm_term=passaggio+contatti+da+android+a+iphone PDF link annotation
    • http://duz-drustvo.si/uporabnik/file/rumugovaxititozifivo.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/87703371716.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/gefov.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/livoko.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/57031814042.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/57131137223.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/14979064781.pdfIn PDF document text
    • https://activepymes.com/pub/file/75253272084.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/46360358218.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/65123434587.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614744a5eda71---59533239714.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/rusasenonemipozebuviluvob.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/18518477761.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/purasakuzunamazetiwota.pdfIn PDF document text
    • https://mollis.rs/files/20317198435.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/gepofelevixegixom.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/bugetegejokigona.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/dajajosowazusefaxiwiri.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/nejizulo.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/jomogapavas.pdfIn PDF document text
    • http://krzeptowski.pl/file/21777642509.pdfIn PDF document text
    • https://grandegroup.net/files/jumim.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/69515909012.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/61454427734.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/34919154623.pdfIn 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://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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 10748 bytes
SHA-256: c7d854d3afa6dabff3327cd1eea5dcd8f05ebb9bb72025a31a74a923d1ab94ef
font_01_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 17476 bytes
SHA-256: 12e9d186ef04a879b4c17c97998addbb7fef2054f3ac1db50782d50e2a4b9960
font_02_sfnt_off00011a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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