Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8fd7957349cc2e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-19 09:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca0f68aff6acf732acf8771d506bcebe SHA-1: 8aed7055c18bf2c3cd21d0a9fa70ff3835572a34 SHA-256: 3e8fd7957349cc2e2d5b82b75a673603cc0b53e7a9cd7c15964dbea491f08fbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URIs pointing to disposable hosting. The PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the overall pattern indicates a malicious document designed to lead users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=first+name+middle+name+last+name+example PDF link annotation
    • https://bu8m3tas68s-b1.com/contents/files/52805669988.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/93455756487.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/5341262288.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/46792589597.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/25607563396.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/tebilunowisiw.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/sunekawojutufu.pdfIn PDF document text
    • https://people11people.com/uploads/File/54891040687.pdfIn PDF document text
    • https://bu8m3tas68s-b1.com/contents/files/47536692890.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/mafipejudanubegazuniferu.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/23105529074.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/doragugotabum.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614598a0a86ab---tiwepokulufoburadegolos.pdfIn PDF document text
    • http://polipack.ru/content/file/64035725146.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/65374402382.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/29233215924.pdfIn PDF document text
    • https://partnermind.cz/images/files/78580939284.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/jetifasixakufonoladexa.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/30110901626.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/rojakod.pdfIn PDF document text
    • https://dptech.vn/uploads/files/77786324319.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/43507556141.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_off0000c68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68A 10512 bytes
SHA-256: 2da96e956da2e5afa8c3e016bda26eff012eeb51fd2f0711cd1cc254d5852616
font_01_sfnt_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 18052 bytes
SHA-256: 75979680ab395e7110afa2c8c360b25839faa846283f6720014ff7e2765addf2

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