Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d13ac7fa3a3fef…

MALICIOUS

PDF

67.7 KB Created: 2020-12-19 23:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a78058d1f2a51405cd6bbfdbb3fde1c SHA-1: 17671aebfff5a277b3d0328ae749c3fd14b989a9 SHA-256: d6d13ac7fa3a3fefb5a8216ecfb4aa469c8658b5ae28678d3d40b32bf5ab0a84
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector. The heuristic firings indicate this PDF is designed to link to a large number of external PDFs, likely as part of a link farm or SEO manipulation scheme to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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
  • 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://traffmen.ru/123?utm_term=senior+shirts+2020+friends
    • https://tidoxanarapora.weebly.com/uploads/1/3/2/7/132710787/330997.pdf
    • https://kowonuzadanovit.weebly.com/uploads/1/3/4/6/134686130/6c58fd.pdf
    • https://moginirem.weebly.com/uploads/1/3/4/7/134769545/fugivobi.pdf
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/pudedolaxoteguzimiwo.pdf
    • https://ruragivelexodi.weebly.com/uploads/1/3/4/6/134663557/vewapilitofepaj_mozobumewuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2199bf55-d552-42b1-b8a7-c6c94df9594c/setifole.pdf
    • https://static1.squarespace.com/static/5fc5797f6b97992eb57a8de3/t/5fcaabbb35f635575f6762e4/1607117758671/download_game_hungry_shark_world_mod_apk_revdl.pdf
    • https://uploads.strikinglycdn.com/files/e52cf2e5-ba3a-4601-8565-1ecae6ee9d19/rugoxezewosuwag.pdf
    • https://uploads.strikinglycdn.com/files/3808200c-6e88-42f2-9c0b-43524330b27d/vilajavis.pdf
    • https://uploads.strikinglycdn.com/files/150ff7d8-50af-434a-a964-e9e255a79711/kodemudelune.pdf
    • https://uploads.strikinglycdn.com/files/f399403b-a729-4fbd-a94f-1fbd3df33582/digestive_reviewing_vocabulary_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/e0251617-225b-4944-9a42-99750c057a7f/fokiziwetodogilibotuwozo.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_off0000cd90.bin
d6ff330a58623a000ee7aaecb2e51d253a912d1ca59f036fa2ee1354173f134b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD90 5128 bytes
font_01_sfnt_off0000df01.bin
763834e68657f22d7124197b45abb2cbbe3d72ca8e39db95edca687617781a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 10408 bytes

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