Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef116061a8ddbfd6…

MALICIOUS

PDF

112.5 KB Created: 2021-05-19 10:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfa5f70186747ea1224aeda60aa661b8 SHA-1: d61e5c62119f1c18d9109659acdb7f87fc2e865a SHA-256: ef116061a8ddbfd6a7e6916f17974e3fa3cf577367973515cbd502ab929c9305
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded links, with one prominent URL pointing to 'seumenha.ru', suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by indicating the document is part of a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=when+do+you+plant+dahlia+bulbs+in+ontario
    • https://dajikunizitawis.weebly.com/uploads/1/3/1/1/131163857/29647dbf2ae.pdf
    • https://dapalirodo.weebly.com/uploads/1/3/1/4/131483520/fulijuwi_gobabati.pdf
    • http://ravuwetob.iblogger.org/96065443108.pdf
    • https://cdn-cms.f-static.net/uploads/4494889/normal_6052333c0ba5b.pdf
    • https://cdn-cms.f-static.net/uploads/4443801/normal_602b595d20474.pdf
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fd66e5e671fd.pdf
    • https://cdn-cms.f-static.net/uploads/4453329/normal_6047b6a3e7076.pdf
    • http://ganivobuka.iblogger.org/tl-wr841n_change_password.pdf
    • https://static.s123-cdn-static.com/uploads/4378836/normal_60082480e0797.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://vavusuj.epizy.com/antimicrobial_peptides_of_multicellular_organisms.pdf
    • https://s3.amazonaws.com/tonisefoteka/61541013782.pdf
    • https://uploads.strikinglycdn.com/files/ac6b56bb-9620-4bc6-9028-798527cfe748/62995171110.pdf
    • http://kofokof.rf.gd/13192701010.pdf
    • https://s3.amazonaws.com/kifutizijebuj/android_iphone_x_navigation.pdf
    • http://jokokimalofov.rf.gd/45579008226.pdf
    • http://varogofef.epizy.com/leleworawaragi.pdf
    • https://uploads.strikinglycdn.com/files/4b0553fa-16d8-4602-ba9e-e55bb1d246eb/86714674391.pdf
    • https://uploads.strikinglycdn.com/files/9dc834d7-a581-4449-9476-719ced0b685c/can_you_rekey_schlage_encode.pdf
    • http://lejaget.epizy.com/aws_certified_cloud_practitioner_exam_guide.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014361.bin
da917351a9bc11a465ee230452b8e698538f0d2e1a7393e0cf561ed453df9c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14361 5184 bytes
font_01_sfnt_off000154f0.bin
f0749a130f6e43e3ea6048e166e378864e0638581492c9fdf759102f70b942d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154F0 4880 bytes
font_02_sfnt_off000166c9.bin
4cae2a721349ad2327e0e7a36a7aaa453ef7a2879cb1c76e4d7fa35db83cf1cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166C9 11420 bytes
font_03_sfnt_off00018df1.bin
afd1b7f845eeff9154c8ddd321da2a722928e57a2e0a6731c08b8b5dd5a20639		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18DF1 17136 bytes
font_04_sfnt_off0001a592.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A592 4324 bytes

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