Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d9ed4e7a5edf8a…

MALICIOUS

PDF

83.8 KB Created: 2020-11-14 10:34:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d884f8a36bcfaf74b6317c66ac212183 SHA-1: 1c0bb2d4d54b759bec1d448ef2a90c588ab79464 SHA-256: 93d9ed4e7a5edf8a21468a9f5ae9a8054600e9b3f9f60d87620d9449bda232f2
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://traffset.ru/123?utm_term=evangelismo+personal+myer+pearlman+pdf+descargar', which is likely used for phishing or to serve a secondary payload. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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-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://traffset.ru/123?utm_term=evangelismo+personal+myer+pearlman+pdf+descargar
    • https://saxigixerugeri.weebly.com/uploads/1/3/4/5/134585582/533d9f0e02.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wotodedaruzuk/76898350240.pdf
    • https://s3.amazonaws.com/pusori/john_locke_impact_on_enlightenment.pdf
    • https://s3.amazonaws.com/suximawo/33493109761.pdf
    • https://uploads.strikinglycdn.com/files/36d7e9c9-dd1c-4cec-8a06-5e00240bf26a/30020378242.pdf
    • https://s3.amazonaws.com/xanebavifamopez/59040788590.pdf
    • https://s3.amazonaws.com/felasorarabipis/67564726550.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/32872096046.pdf
    • https://s3.amazonaws.com/fukepez/2012_ap_chem_free_response_answers.pdf
    • https://s3.amazonaws.com/mipeboro/ikea_catalog_2014_download.pdf
    • https://s3.amazonaws.com/zarelusipofox/7157045356.pdf
    • https://uploads.strikinglycdn.com/files/f8afdb17-ad1c-47d2-90a6-948ff5c4032c/the_garden_menu_pik.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_off00010693.bin
cec36e662f09105dcf4df5a1adef5684055178ab2b96ae7e1a51a9a7c5fe3b67
pdf-font-stream PDF embedded font (sfnt) at offset 0x10693 5596 bytes
font_01_sfnt_off0001199f.bin
c203fee512b1b7c2f8ad89d1fdffabccfa7de2e385edc5c039b35094420027e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1199F 11480 bytes