Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fad4436b5811dba…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 12:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 182a13c14ce699d1424d6b8bb50a1741 SHA-1: 3022da29711e5b8eff19dc242e3d265dcc25b46b SHA-256: 6fad4436b5811dbacfea16daa49b90e24cdfc6a82e99d60e724c027140388f86
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to a link farm, a common technique for phishing or distributing further malware. The PDF's structure and the presence of many distinct hosts suggest a deliberate effort to obscure the ultimate destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chrisdepanneservices.com/Sites/cds/files/xivudomuzelobogog.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137823fed098---tutabolomoresafopavib.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/53784710646.pdfIn PDF document text
    • http://orthodoxnews.us/file/gibafo.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/69336496489.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/56202749525.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/gugokuwisudoxojikej.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/tatun.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/sutuzulurisatogebabafejok.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/92686102664.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/sidunexaguvevor.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/bifewadefigivol.pdfIn PDF document text
    • http://djapm.com/userfiles/file/49728920020.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/vakimediw.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/41928861255.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/25897389876.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/54494502074.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/34050371107.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/zunibowinikukaxexuroma.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/waderezobiwutelenopa.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/81191643507.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/jokaborimozadako.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/kalujutubojaribaxorobukov.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d475bc3556---94441263184.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/zifoxutimura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=millennium+wolves+read+online+freePDF 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_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 18292 bytes
SHA-256: da2cc0e55ba65b5434dc84609eeed71e5599583759ca72f1bfcb0c6946be0be2
font_01_sfnt_off000117b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 10660 bytes
SHA-256: 931a524472852b177d07dc14dd316a36b621d95b48a7fcf69198e98193a13f5f
font_02_sfnt_off00013021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1