Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b59ff80c1ce6bb…

MALICIOUS

PDF

115.8 KB Created: 2021-01-15 01:05:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aa462bf4d3eab22a9a8da6c331c5a3f0 SHA-1: 70236dc314438662aee6008964d468771ddef8a2 SHA-256: b3b59ff80c1ce6bbeb53e8fd332b138aaeb20753dbab5b3cc6ea7835cc3073b0
164 Risk Score

Malware Insights

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

The PDF contains multiple external links, including one that appears to be part of a link farm designed to attract traffic. The presence of a "download button" heuristic and the ClamAV detection as a phishing trojan strongly suggest a malicious intent to trick users into downloading further malicious content. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://trafffi.ru/aws?utm_term=visiting+card+design+psd+hd+free
    • https://cdn.sqhk.co/vapezuwe/YL7lYij/rorajokozutafokuw.pdf
    • https://saduzuwaz.weebly.com/uploads/1/3/4/5/134599146/jepadazusegome_busovodekoko_gixilak.pdf
    • https://cdn.sqhk.co/xakelafu/sgcPGhe/47541506394.pdf
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/xusamipox.pdf
    • https://zadisoro.weebly.com/uploads/1/3/4/5/134525292/wapogevorox_jigefav.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dinilederu/41202221883.pdf
    • https://s3.amazonaws.com/tefelaj/88911407919.pdf
    • https://s3.amazonaws.com/rijaliwiguvex/internet_archive_books_free.pdf
    • https://s3.amazonaws.com/dotivaf/autocad_2020_trial_version_free.pdf
    • https://s3.amazonaws.com/xapijifas/vichara_by_armaan_bedil_song.pdf
    • https://s3.amazonaws.com/gewisetug/national_registration_identity_card_template.pdf
    • https://s3.amazonaws.com/jivala/24073122774.pdf
    • https://s3.amazonaws.com/wofaxil/ritamalaseze.pdf
    • https://s3.amazonaws.com/vitelitubovuluj/fuvolijozogelizalabe.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_off00015d09.bin
5c4cfd59c8b6b454cdc79822b00e0d84271314beeef802d18ddd084f38ef4607		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D09 5028 bytes
font_01_sfnt_off00016e0d.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E0D 1800 bytes
font_02_sfnt_off0001769a.bin
d1f5f70fe4e9d9bc5c1ab0131cfb89c48dd663b4b7d3ae63b16ed98364123299		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1769A 11140 bytes
font_03_sfnt_off00019ca8.bin
f2b1b9c020e199cdca8aeea65d35b88f79b72c0bc163306035cc972894fb2916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19CA8 16660 bytes
font_04_sfnt_off0001b2db.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2DB 4324 bytes

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