Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62b083cc16b3d81…

MALICIOUS

PDF

68.9 KB Created: 2020-11-20 07:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a251fe8cc4535c9be36585556a731833 SHA-1: 480413c9793bd0963e51707898a7f32261606fd9 SHA-256: e62b083cc16b3d81e42aa31e44af1685bcc803fa4e57324118b6e0c9a930dee0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains including weebly.com and trafffi.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://trafffi.ru/123?utm_term=social+work+interventions+for+dementia+patients
    • https://bopenuxot.weebly.com/uploads/1/3/4/6/134667357/5415891.pdf
    • https://dawiganolakegoz.weebly.com/uploads/1/3/4/3/134367714/xavewa_giwitekusuzuwon.pdf
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/bubifapakorubera.pdf
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5f938fb3e20e5.pdf
    • https://vunolevakedo.weebly.com/uploads/1/3/4/3/134317922/dokakiribuj_fovoso_dadepuko.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rawesaragegugar/sobufiweke.pdf
    • https://s3.amazonaws.com/pokixovuxik/19154646973.pdf
    • https://s3.amazonaws.com/zasepo/99676654946.pdf
    • https://s3.amazonaws.com/pusixa/bluetooth_video_song.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_off0000d118.bin
b80ef86280a8579d9fb3d5a253a2891102ff9515101b03f0dac65a1b1ca459ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 5620 bytes
font_01_sfnt_off0000e43f.bin
fb2401981ca44f33fbcdcf41d64eaf502103601ca6bc68919438c5a47373337e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 10316 bytes

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