Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebbdd22a74e08e3…

MALICIOUS

PDF

78.7 KB Created: 2021-04-02 05:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e196b9135ed2be3014bb5f390dca04c SHA-1: 6426dda19467e298c9644290002bca139e2fa265 SHA-256: 7ebbdd22a74e08e306e25f53d46fe1b9c026927c13d7c23262c18b0cda16cd24
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various domains, some of which are unknown and potentially malicious, while others are benign. No scripts were extracted from this sample, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=deadpool+2+drive+mp4
    • http://digtalcaliper09.xyz/is_rain_barrel_worth_the_moneykwzoj.pdf
    • https://fugurisugo.weebly.com/uploads/1/3/6/0/136086283/sobesa-dopijoz.pdf
    • http://twirlini.com/woxodisarejoteterizo089to.pdf
    • http://disconto50.pro/67816591313h7dyi.pdf
    • https://vosujesu.weebly.com/uploads/1/3/4/6/134646347/241524.pdf
    • http://hangookoil.ru/python_nested_dictionary_keys_to_listcgazx.pdf
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/ea93a2c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/galinikagopit/92859360067.pdf
    • https://s3.amazonaws.com/zonebon/blitz_brigade_apk_rexdl.pdf
    • https://uploads.strikinglycdn.com/files/5a228845-35b2-4bc1-939f-eb0d857deb0b/43216296987.pdf
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_79d6a29d6dad4ff6a9c477ca367e3cee.pdf?index=true
    • https://s3.amazonaws.com/kovilowab/book_binding_machine_manual.pdf
    • https://s3.amazonaws.com/sizadagazagaj/benyamin_biang_kerok_reborn.pdf
    • https://uploads.strikinglycdn.com/files/45d929ec-9321-4e5d-9b8a-b9831c136cbc/epson_nx230_printer_troubleshooting.pdf
    • https://s3.amazonaws.com/pukiza/suxuxolovevelukuwe.pdf
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_1033ebac0ac44ca39c40a14d45d14f67.pdf?index=true
    • https://s3.amazonaws.com/padosumifubobo/aristocrat_lo_liner_manual.pdf
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_a3061d5684d24f84aca716933a990427.pdf?index=true
    • https://s3.amazonaws.com/fidefofudi/41199039875.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac2.bin
a2fb7fe58707b673619990b21779dd2bc41db9980db878b0024266fbaa671efc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 5204 bytes
font_01_sfnt_off0000fc75.bin
2f7f3a13e24a40460c0b029ea719cd6a039233e56f6db327d975e0d02214fbcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 16128 bytes

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