Malicious PDF — malware analysis report

Static analysis result for SHA-256 539fbc5876644b15…

MALICIOUS

PDF

78.9 KB Created: 2021-03-14 09:35:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a058fef713877c961dc4789caf04ffd SHA-1: 276d2473ccecb55e8f0a15111a158f324c7fd120 SHA-256: 539fbc5876644b152ea6a9b3a7adb3f1e96b2a8b5c7cc3b976e82e67fb697b7d
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL pointing to a domain associated with phishing. ClamAV also detected this file as a phishing trojan. The document's structure and the presence of numerous external links suggest an attempt to direct users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/award?keyword=archbishop+benson+idahosa+books+pdf
    • https://pegujugadul.weebly.com/uploads/1/3/1/6/131637136/36a8d4777a7a7.pdf
    • https://cdn.sqhk.co/tizepajawato/gebigUY/kadepavo.pdf
    • http://megivisu.22web.org/30701334807.pdf
    • https://bezatawe.weebly.com/uploads/1/3/0/9/130968967/2272927.pdf
    • https://vofitikasu.weebly.com/uploads/1/3/1/8/131871658/8786390.pdf
    • https://cdn.sqhk.co/tiwefuxab/BHggugi/fetesupi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bujepuzetotoj.rf.gd/sinupurepugikifowuju.pdf
    • https://uploads.strikinglycdn.com/files/1f63822b-bf75-458d-9951-255a50b2dfaa/the_summoning_kelley_armstrong_epub.pdf
    • https://s3.amazonaws.com/sirilagewuga/word_cookies_mocha_special_level_answers.pdf
    • http://jexiduro.rf.gd/article_format_spm_2019.pdf
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_360148c758774f65ae9b39c55a981ab5.pdf?index=true
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_4a76586ebddc4d229f981feb0aea86d7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a073aac7-aa17-4853-9128-7e2666e2e223/18215617862.pdf
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_18b5f09394b34da0b4865c8da4044b74.pdf?index=true
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_1d3384a64c9a4235a778efac514f6ca2.pdf?index=true
    • https://s3.amazonaws.com/jupudizadid/chamberlain_whisper_belt_drive_manual.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_off0000f8e5.bin
2e580737acbcede9615929b347cccf97c48b6de415ac0288f964efe41d7bc285		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 5404 bytes
font_01_sfnt_off00010b3c.bin
7be5a943d1fb9802a8b3250a3d5a6d9e4f99bb7f142c0595ed494b9d7d4eb00c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 10160 bytes

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