Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0a452e4700ca01…

MALICIOUS

PDF

73.3 KB Created: 2021-09-21 21:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80cd1dca6cb3d06e2f91291043fcb018 SHA-1: 473b8dfdcf656a9370686ac59431f75feac3a38a SHA-256: cf0a452e4700ca01c5afa812da2c630c0c5b21e145467fb5e9bfbaa7758e75f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of techniques used to redirect users to malicious content or for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://gewoongroen.eu/app/webroot/files/userfiles/files/3416340606.pdf In PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kozirifesuxekexugumatop.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/32554131528.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/88007965305.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/waxafizilisegifagitox.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/1064375880.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/63973595e49aecbecf8694967edf89fc/tifadedupizovowidomiloga.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/73954403776.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/xilenoxa.pdfIn PDF document text
    • https://online-wums.com/files/files/42210548041.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210912/0400457895.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/tadawedo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/69394567800.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/65497325524.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f4b1224ccc85c8210a1e1e343cb277dc/vutozamajevokugufod.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/vesaretomevavebafoziw.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/ketujiroviwedavusonabos.pdfIn PDF document text
    • https://aromamarketing.md/img/files/56218055869.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/93596066258.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/lutatutibuwolewiwoj.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/wusiwifosesoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=ninja+heroes+reborn+apk+downloadPDF link annotation
    • 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_off0000baaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAF 17152 bytes
SHA-256: 500cc1905105b4a9677a43093d4b21f0451a2353023329825b7e60f277660bb7
font_01_sfnt_off0000e748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE748 10816 bytes
SHA-256: dc20c90c01d0541bbef7e4376818533051f1672271399900151a361a38f6c848
font_02_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1