Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6cb42275ce9d18…

MALICIOUS

PDF

82.6 KB Created: 2021-09-20 06:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b89b2a324128b10a7a69d227490b4655 SHA-1: e641c66d9ec3ad1d386ddc135f837c8aeba7e4d8 SHA-256: 9b6cb42275ce9d18b3fa5d166aa6bf08cd09324824ff118637e36a329c6288a0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The presence of numerous embedded URLs, many pointing to potentially disposable domains, supports a phishing or scam lure. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://westernmaki.com/uploads/files/46602259202.pdf In PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/70822892410.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/bixiluriwajofesiwik.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161409d0d81cbc---wabukolijamolupam.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/78193110409.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/89621168185.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/12092478554.pdfIn PDF document text
    • https://suruburi.net/mm/file/gidunobotosekef.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/watipupig.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/sosidizawobesofafosajow.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/xevazenizijimobiza.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/53790078621.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/digerizetozesudagumu.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/61619155513.pdfIn PDF document text
    • https://airbays.com/userfiles/file/72965366385.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/87238520322.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/bawagagevusemorupuwisaw.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/4011968444.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/bokidazimaxifosuru.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/wovogepuzovabapedi.pdfIn PDF document text
    • http://hodori247.com/uploads/files/wufipodazub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=relaxing+games+iphonePDF 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_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 18612 bytes
SHA-256: c10d3beb28943960c150b1a6020ead27324328270c69b241f9df246ec1e53858
font_01_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 10648 bytes
SHA-256: 4620f417afd60a07009ff01269f411bff398ea862cafd74a4d2a6a65562e9b77