Malicious PDF — malware analysis report

Static analysis result for SHA-256 105a970e13aa59c9…

MALICIOUS

PDF

69.9 KB Created: 2020-12-20 05:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 131dcc35bfd10da5e91a813e1257f172 SHA-1: 9cfd4cdbabf9afc37aa84de08eb8cfa2c82673b3 SHA-256: 105a970e13aa59c990ae2d201a4ea86cf6629ae4b1142477f2b2898e39218ab9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical PDF link farm detection and ML classification. It contains numerous external links, with a primary malicious URL identified as https://traffnew.ru/strik?utm_term=bike+basket+for+dogs+15+lbs. The document's structure and the presence of many links suggest an attempt to direct users to potentially harmful content or phishing sites, likely distributed via spearphishing.

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://traffnew.ru/strik?utm_term=bike+basket+for+dogs+15+lbs
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/d5def2fea.pdf
    • https://tutitobogin.weebly.com/uploads/1/3/4/4/134485970/duvogavex-juxenexasuse-tiletosomani-felik.pdf
    • https://wazalopa.weebly.com/uploads/1/3/0/8/130814586/afaee4636.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/posufij/16148302930.pdf
    • https://uploads.strikinglycdn.com/files/0c094ef9-b54f-43e4-82a6-722638a4ee63/wokududodojufato.pdf
    • https://uploads.strikinglycdn.com/files/c9f16ca9-6291-4596-a3c3-d89f45ded429/vokisexo.pdf
    • https://uploads.strikinglycdn.com/files/1b6a74cc-2383-47c1-a7ae-07321d9b33e0/vugupojevisisekiwexin.pdf
    • https://s3.amazonaws.com/remufuzu/cedar_rapids_gazette_milestones_forms.pdf
    • https://static1.squarespace.com/static/5fc687f5df132613bbe462d8/t/5fd1ba6c0f163860c7ae57be/1607580269648/among_us_notepad_website.pdf
    • https://s3.amazonaws.com/vabedafozo/94742428405.pdf
    • https://uploads.strikinglycdn.com/files/cfcab612-2802-41d0-9a6d-23a487645216/53269224585.pdf
    • https://static1.squarespace.com/static/5fc0c55440f1034a5ca82015/t/5fcc596033187724c4e7eb64/1607227745362/games_like_i_love_hue_online.pdf
    • https://s3.amazonaws.com/zowejunef/latest_bollywood_video_songs_2019.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5c6e9ee0f32b874b26b6/1606376559211/skirt_with_pockets_tutorial.pdf
    • https://s3.amazonaws.com/nuxomigo/vemepixisogum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87c.bin
7fe8fc0b37cc9f241fcdb2a8e677e7efdc126758cf335b34595e157d6ae1a646		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC87C 5188 bytes
font_01_sfnt_off0000da37.bin
a8b655e67580dcbf7a95685abff08202c09bb7f9f711a1a49c934d86ec867b64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 10152 bytes
font_02_sfnt_off0000fcc3.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 4324 bytes

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