Malicious PDF — malware analysis report

Static analysis result for SHA-256 500a4bba921c200f…

MALICIOUS

PDF

73.6 KB Created: 2021-03-23 02:06:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0d744d6a193bbe4237a571d0599fa72 SHA-1: 79492cf70372071d19ba6a35b56ff1ac4c058e6e SHA-256: 500a4bba921c200f91f7bdbc6ec99eab575eb7f7ec7a11f40232b19e92aed1ed
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with a primary malicious URL being https://druttle.ru/wix?keyword=smash+the+computer+whack+it. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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-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://druttle.ru/wix?keyword=smash+the+computer+whack+it
    • https://roxuxafuz.weebly.com/uploads/1/3/0/8/130813852/5010414.pdf
    • http://digtalcaliper09.xyz/wojuludatubejebuvefgnmhk.pdf
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/nuditonejadugebe.pdf
    • https://cdn-cms.f-static.net/uploads/4449774/normal_5fd91802c5ecd.pdf
    • https://static.s123-cdn-static.com/uploads/4404964/normal_6004a71f9f7bb.pdf
    • http://mscgis.net/liz_greene_uranusl09r9.pdf
    • http://vamoktin.ru/rafabujf1ny.pdf
    • https://static.s123-cdn-static.com/uploads/4489061/normal_60001710820b8.pdf
    • http://baykamif.space/nizutop2tp38.pdf
    • https://cdn-cms.f-static.net/uploads/4368999/normal_6041dcb23e270.pdf
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/7728f7c8fee0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a264fd5b-8640-4d63-8b0d-197d236e7910/fokinoperivirururabud.pdf
    • https://uploads.strikinglycdn.com/files/0d8aa64e-3aa2-4912-bf00-44467b8105f0/how_to_install_a_swann_camera_system.pdf
    • https://uploads.strikinglycdn.com/files/d9fb6962-759c-4975-9191-9a2aa9ac8345/tuwetawepo.pdf
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_0ba5a04563f7490e8bbf71c23cc618c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c35b9c4f-c90f-41a3-a62e-98430d003cc5/design_of_reinforced_concrete_structures_book_free_download.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_off0000e165.bin
b54f0a4af44d3bf2cb2e560c349405189900df5b974a29e5fcde0bb4976629d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 5400 bytes
font_01_sfnt_off0000f3a7.bin
15acd03b7abdd1ae8bb39e5ccc2fb90fea56d4b340b6b4bdba5ec82e9b3f291f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 10820 bytes

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