Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fab670f26439f5…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 17:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c6eaecfe9ab8ecd81d6937d135a5475 SHA-1: ea6b2cdfe3e29f9ea5b3527af17493a96a349730 SHA-256: d0fab670f26439f5a5fbfab7177626b1af0e97ff77ffc6e5ce0e25dc4cffc137
134 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to obscure the ultimate destination. The presence of a 'download button' heuristic further suggests a lure to download additional content. While no scripts were explicitly extracted, the nature of the heuristics and the numerous URLs indicate an intent to redirect the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 https://medvor.ru/uplcv?utm_term=chekka+chivantha+vaanam+full+movie+watch+online+123movies PDF link annotation
    • http://incomsistema.ru/ckfinder/userfiles/files/14621107784.pdfIn PDF document text
    • https://trexanh.net/upload/files/25578219952.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/4894445233.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/7830312405.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/wogofepudadamu.pdfIn PDF document text
    • http://teresachild.com/upload/files/dodowetimejexalawokizuji.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/dusimeje.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/filobuzakewaliniwixeji.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tinexuk.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/72716265335.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/gumas.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/jovuzazadelutozorowuz.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/15040919026.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/78766261980.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07e064c79---fulefepenoj.pdfIn PDF document text
    • http://afslab.asia/upload/files/10045785444.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/bagoxigukumugoximelazerig.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/9618537488.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/58707393451.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/pejawawidunetedefewusidud.pdfIn PDF document text
    • http://sushibelovo.ru/files/60650046232.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/kisifavuzeb.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137db75a1e2c---pidolaxajovebubupinab.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/takewilexidobagopiwakozem.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_off0000e3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CB 11220 bytes
SHA-256: b2cca51ea9ed29273a6e9b9695055a1e2eb7b5555082d32a00aa543adb67bfb3
font_01_sfnt_off0000fe1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1C 18240 bytes
SHA-256: 25e98c0fdffc2a8d282fee705a90fdd9d713fb687703a7ad972c6c763d42df35
font_02_sfnt_off00012d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1