Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3fba5c6ed92875…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 18:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07d4060e5e4912dd86751725dd4cc8ba SHA-1: e99ee233908a79a66820bc9b1c8cb07a031ebe5c SHA-256: bd3fba5c6ed92875afdf2774e5ccda03c2ef4e129a6b2c038ec3c661a4538989
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs pointing to external sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these URLs are part of a link farm on disposable hosting, a common tactic for phishing or distributing further malware. No scripts were extracted, but the presence of many external links suggests the PDF's primary function is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=view+deleted+text+messages+on+android PDF link annotation
    • http://kyanite.tv/userfiles/file/josexiwesub.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/lagabad.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/30027670064.pdfIn PDF document text
    • http://gulfapex.com/uploads/file/fifonebuboxijexopuxilolig.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/30600600431.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/47781869046.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/79023222480.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/pirunukezulivanu.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/69321251671.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/22735742749.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/95893569620.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/15788302046.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/bazarowobusekebewoz.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/wekolemimegipabozusapep.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/gagoxatanewizemobaba.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b615cbcf---xinipadomagika.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/rubosewuti.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/dorovokovexe.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/20306355875.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/vatidape.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/barifonironineme.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_off0000c31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31C 10748 bytes
SHA-256: c04600ef83e77bfb69153a358293ecb7b05959f6cdb49fe10ed326a85585d3fa
font_01_sfnt_off0000dbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 17400 bytes
SHA-256: 9c3ce71cec1101c1416cf6d3eff24fcafe23c576150453708a11410a8a1783b9

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