Malicious PDF — malware analysis report

Static analysis result for SHA-256 790a8b51d4356063…

MALICIOUS

PDF

103.5 KB Created: 2020-12-07 04:16:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9c08a0646e0838524fd5923d5f9b801 SHA-1: 15b77d1955301d79931d6b1c74961457b0a0ee4b SHA-256: 790a8b51d4356063fc3064815939619c148cda20d54ea38c020d1f32bd1b7047
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The embedded URL 'https://trafficel.ru/123?utm_term=mike+scott+waterboys+twitter' is suspicious and likely part of a phishing or SEO spam campaign. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the overall structure suggests a malicious document intended to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=mike+scott+waterboys+twitter
    • https://cdn-cms.f-static.net/uploads/4445338/normal_5faaff998fa37.pdf
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/f9c933793ed8f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wixatax/43604751622.pdf
    • https://s3.amazonaws.com/jedobufudajewu/multiplication_decimal_worksheets_grade_7.pdf
    • https://static1.squarespace.com/static/5fc0e5b8a3bf4b14aba92f9c/t/5fc1d4aa9d79364840d0f95f/1606538412165/forbidden_tabitha_suzuma_audiobook.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdeefa1972c46e3c642a30/1606283002781/95246243846.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd07c845ca4f7902678c32/1606223817318/bluetooth_usb_dongle_driver_windows_7.pdf
    • https://s3.amazonaws.com/wixanarer/java_programming_tutorialspoint.pdf
    • https://s3.amazonaws.com/zokokamu/the_town_mouse_and_the_country_mouse_fable.pdf
    • https://static1.squarespace.com/static/5fc14f18d26ff1194f767c31/t/5fc53fb99b1ed0353888c148/1606762426058/basepozosopawujatefuwuzu.pdf
    • https://s3.amazonaws.com/tuxutedi/zadugikesubutil.pdf
    • https://s3.amazonaws.com/fisulefajow/pathfinder_online_character_sheet.pdf
    • https://s3.amazonaws.com/pusori/91716067459.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_off000157f7.bin
8f8289f74813103b6ad000afea621b20e0f9ca76df81fff650054517586fcc32
pdf-font-stream PDF embedded font (sfnt) at offset 0x157F7 5164 bytes
font_01_sfnt_off000169c3.bin
2d0a7d749929347594ee771612b5d8d8d9e5aec37ab57a6cebd5fca31503abc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x169C3 11480 bytes