Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85053e3c953967b…

MALICIOUS

PDF

85.5 KB Created: 2020-12-17 08:55:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: bbb36fc75f44e99872bbc192a07a943d SHA-1: 15348f500fd1656a82d02e7e435d3e018997debd SHA-256: c85053e3c953967bb1c424fe1b93ad75effa081422f6c623dc20bbff4e8f7ca2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these linked documents. No scripts were extracted, but the PDF structure itself is used to host and distribute these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafffe.ru/strik?utm_term=airsep+concentrator+service+manual PDF link annotation
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/nusozerajigufidis.pdfIn PDF document text
    • https://morekifozolil.weebly.com/uploads/1/3/4/3/134332894/7986942.pdfIn PDF document text
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/xolozoferip.pdfIn PDF document text
    • https://tusidotug.weebly.com/uploads/1/3/4/4/134482214/mirofunoler-mapijo-zevud.pdfIn PDF document text
    • https://goxapumub.weebly.com/uploads/1/3/4/8/134884232/losul.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/pimok.pdfIn PDF document text
    • https://mawepalutolura.weebly.com/uploads/1/3/4/0/134040672/retifonilop_nadamudopufabo.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/3ad729a8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/93026448115.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/57861768934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89897ba2-88fa-49a0-baf0-33c914030d77/ti_34ii_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/14207539695.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001204b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1204B 22376 bytes
SHA-256: eff47e77ff32f1348e63604c77d731784e4fbb063a76138b2f6f6a6ca2ca6dfa
font_00_sfnt_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 5128 bytes
SHA-256: 115ac07d6b5ddddcf71979c6dd0559aab5440a04f59d30f0787cac3c3d616678
font_01_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 11284 bytes
SHA-256: 04fc2140e5346a3c0e24fb4374b27d8159a496c24b472cc2812603b142b5272f

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