Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca59ba6dd78e4bf…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 19:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 017e873ae84198a6682d0de975b7069d SHA-1: 976ff89fd86aeac0da8ec9dfb4bb691913ad0183 SHA-256: fca59ba6dd78e4bf20fe203523fceb4044e518cc89b8fa9b63928a010468d223
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=playstation+2+apk+download PDF link annotation
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/vibizajapelidama.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/29848910937.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/42866381841.pdfIn PDF document text
    • https://chptravel.ir/data/file/52284255290.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/zunemosu.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/jelisomakivudal.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/gidenelifoxafagokijaj.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/nenuvenododem.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/waxonisuvorep.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/mosebinapupegafulu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b733e52b9e---52674940796.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/73735045013.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/bugujir.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/digituxovakiwilawo.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/jefuwimamutuxifipovuf.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/zezunegesapipukulewu.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/58913152659.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/dazitorenanive.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/93552314624.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/59952737722.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/14878472417.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dupaxuwifazovakilodil.pdfIn PDF document text
    • http://byecook.com/ckupload/files/17777746720.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/28857590051.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_off0000afab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAB 15912 bytes
SHA-256: 1dc17a118fd9a300184b364d7158b6b41a66d42996e9171aedf36a2cf6bab744
font_01_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF017 10568 bytes
SHA-256: 92d8507719e296a19633fb694492f23937c3aa39fad817f1f36d69ed59a7e178