Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefb4013ec3af7c2…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 21:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c9f84239e605a5d21ae9504d883c2f0 SHA-1: c3090b4ebfd414eb7de394f09c4e76df320a7145 SHA-256: fefb4013ec3af7c23e4ee66ebfede93eefd67c37f5e4436dadc3e4f66c11f77d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm, a common tactic for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://samajsutra.com/userfiles/files/87189634409.pdf In PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/59824766343.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/wafusizimodaxiful.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/18147021981.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/mofonovijepatugomotig.pdfIn PDF document text
    • http://www.og2c.com/images/file/79212371932.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/tuwogi.pdfIn PDF document text
    • http://full814.com/upload/files/sadiniz.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/1039738040.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/94408121195.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/46047923151.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/fuximabofuz.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/lemawufodo.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/56623014039.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/9119078830.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/bevofow.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/43398378838.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/xukiranigo.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2044a81e40a3c4e23f9dc2d9929eca0b/31519827885.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/jijobuz.pdfIn PDF document text
    • https://akemi.ro/hirek/file/60445413635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=screen+recorder+apk+2021PDF 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_off0000b1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 10564 bytes
SHA-256: a0bc73ff76804ec51d4916399eeb6afa91e0e3dae5d7f122a0cb2a89627e92c1
font_02_sfnt_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 17760 bytes
SHA-256: 05381261756f9c0a122f7fe0e1dcb24e3e980b128f1c5424f4fbd7ff785870d7

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