Malicious PDF — malware analysis report

Static analysis result for SHA-256 670c4c9246d70fb0…

MALICIOUS

PDF

72.9 KB Created: 2020-12-28 12:56:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 93bf4069ca69bcb907707634dbf25919 SHA-1: f5e74a4f4459d395cacbf427436d76fc6520ef65 SHA-256: 670c4c9246d70fb0a4f5d495012369d069f99d6b524df6993fc3af71524979cd
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious nature of the document, likely as a lure for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://gettraff.ru/strik?utm_term=teaching+assistant+job+description+pdf In PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/FNgg9je/big_number_cell_phone_for_seniors.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/93ijqhi/24161186769.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/jcglQif/49814024525.pdfIn PDF document text
    • https://cdn.sqhk.co/liramesot/djhhdUa/bravelands_book_6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2856c16e-e2da-43ab-ad2a-62a7ccfe3e92/sedokixomefig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e379f2-3629-4469-87e0-c823da1d7bf1/konikukegatowigifaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6bddeb2-b05d-4edf-a511-1e5732705b2b/watukutofozurabevuwul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58fcbfb2-cf94-4ebe-a1f9-a44f640562a0/94093151889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41d9a3a-3e63-4b3b-98b2-17a161f9e332/life_is_feudal_forest_village_mods.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/charitable_deductions_tax_reform.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c51eef0-376d-45fc-8482-26707a1f5715/deganepanoxizonikewut.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/pisemigafetolixazog.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F2 5548 bytes
SHA-256: 89459775fe26f45622c4ba83401859137be6cfd54cacc21c9c33ed513945e78e
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 10396 bytes
SHA-256: 4516d04bfefe6dcbca5b97164517bdd8258c95d3b8e3395953de833bff663a4f

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