Malicious PDF — malware analysis report

Static analysis result for SHA-256 739ccc210a1ea577…

MALICIOUS

PDF

79.8 KB Created: 2021-04-02 10:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 144453fd755cb0dae70684cdbb22aef8 SHA-1: 71c6beac2668dbf8dc0bf325bb8fcb753ab88212 SHA-256: 739ccc210a1ea577661093320028a8a6c32547150ea49851a5d25fd4122b2017
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a PDF SEO link farm, indicating an attempt to generate traffic to external websites. One of the embedded URLs, 'https://xezojet.ru/wix?keyword=lucky+the+chosen+one', is flagged as unknown and is likely malicious. The presence of numerous external links, many pointing to S3 buckets, suggests a tactic to obscure the true malicious intent and potentially distribute further malicious content. While no scripts were explicitly extracted, the nature of the link farm and the ML classifier's high confidence score point towards a phishing or malicious redirection scheme.

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://xezojetit.ru/wix?keyword=lucky+the+chosen+one
    • https://rozapalevode.weebly.com/uploads/1/3/4/7/134705228/vavinerotuj.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/luxukov.pdf
    • https://duxakezise.weebly.com/uploads/1/3/4/7/134713437/gejivaloxibor.pdf
    • https://tekazomegi.weebly.com/uploads/1/3/4/0/134017279/bigifir-mogazeba-vudetop-dokaga.pdf
    • https://nijupafubowawiz.weebly.com/uploads/1/3/4/0/134012726/befuwavutudepe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/regufojalojaza/welcome_to_shadowhunter_academy_epub.pdf
    • https://s3.amazonaws.com/mikibetiv/miniso_bluetooth_headphones_manual.pdf
    • https://s3.amazonaws.com/xetasif/26543115356.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_ea7b3fe01f1a434f99949f474bfec5b8.pdf?index=true
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_3f2b7f459b314079a50f5b8a7a23cb3a.pdf?index=true
    • https://s3.amazonaws.com/safago/20314337973.pdf
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_8b59484b6f7043e0b36dd8f394073fe2.pdf?index=true
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_0dd0ed5be25c41359ba930efb933196f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92e530da-abca-4511-a584-6ecc06ecb531/forar.pdf
    • https://s3.amazonaws.com/zukogi/75087539806.pdf
    • https://s3.amazonaws.com/vofadoloves/53974393838.pdf
    • https://uploads.strikinglycdn.com/files/031265aa-2029-4208-a8ff-a1c6408462e2/28376133784.pdf
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_860ad41c754e43b0a5331153517462da.pdf?index=true
    • https://s3.amazonaws.com/xukanomarexumu/92755339656.pdf
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_8934aaa3aff447f0a05c7e6b2b4460ad.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b8.bin
f08b3bb6413e6a50a369e1515846009a0d3d1c8176e3c304f5e8abaef794f943		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 4656 bytes
font_01_sfnt_off0000f6a7.bin
eb096ee5455529e91cb46cb9bda076640d80dad28d1cfd358c0974ac7a3fd169		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 10956 bytes
font_02_sfnt_off00011c65.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 16312 bytes

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