Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6e19bccde7f8182…

MALICIOUS

PDF

83.6 KB Created: 2021-03-20 00:09:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f6d527856e6c2f4bd49f8f494c9e99b SHA-1: 230139eb96d68dadb082728ee4ef55cf88b983a7 SHA-256: e6e19bccde7f81823e83270f22e5a5c9c76e023b602f1d7f20a885a6723e75ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a large number of external links, with one pointing to a suspicious domain 'dafemum.ru', suggesting it's part of a link farm designed to distribute malware or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL findings strongly suggest a malicious distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=unknown+cheats+world+war+z
    • https://static.s123-cdn-static.com/uploads/4458839/normal_5fec943ea878d.pdf
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/bifalazaxurari-sibasabodi.pdf
    • https://cdn-cms.f-static.net/uploads/4381988/normal_6041465fcab1f.pdf
    • https://biluvumilu.weebly.com/uploads/1/3/1/8/131860938/wilikiloganetosogafo.pdf
    • http://lozomaneje.getenjoyment.net/cedaw_in_tamil.pdf
    • https://cdn-cms.f-static.net/uploads/4369143/normal_605520c12c7b6.pdf
    • http://gilumesu.mypressonline.com/lauren_kate_fallen_review.pdf
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5fef0fdc65006.pdf
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/7c66062990.pdf
    • https://kapadarobuziwel.weebly.com/uploads/1/3/2/6/132696145/5387263.pdf
    • https://sutofuwanunow.weebly.com/uploads/1/3/0/8/130874369/galinokiforeror.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/94067c8c-b698-4444-9a81-1b101116c6f0/jamam.pdf
    • http://wepikupovug.myartsonline.com/nike_brand_guidelines_2020.pdf
    • https://uploads.strikinglycdn.com/files/60abde80-51f2-47f9-971b-d57222ef6956/ludisilufotesizaw.pdf
    • http://kivozusemu.atwebpages.com/jalanidhi_project.pdf
    • https://uploads.strikinglycdn.com/files/202de047-bc80-490e-b86e-19ab507d0a23/lojumirigamekikagij.pdf
    • https://uploads.strikinglycdn.com/files/36c85d49-6258-4112-b38a-75728e1801bb/sixariwogimimomumi.pdf
    • https://s3.amazonaws.com/godewumazek/piwebulikumaze.pdf
    • https://uploads.strikinglycdn.com/files/68558980-f496-4230-9ff0-ebba0679020f/surah_mulk_urdu_translation_download.pdf
    • http://rexefobixavater.myartsonline.com/causes_effect_and_control_of_air_pollution.pdf
    • https://uploads.strikinglycdn.com/files/2049ef0d-a5eb-4ecb-b862-2e1d896c313f/zinolesupaf.pdf
    • https://s3.amazonaws.com/vutame/best_free_guided_meditation_podcast.pdf
    • https://uploads.strikinglycdn.com/files/53fc104d-9d3a-4b9f-89a9-f66504594e07/zobikirepile.pdf
    • https://uploads.strikinglycdn.com/files/4ad5cbf8-1897-4400-8dfb-5d013619a2fe/herman_bavinck_reformed_dogmatics_abridged.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_off0001096c.bin
dfa6afefe25588b0a9db57c86f836c9bdf14936cd6c076dff097f3b4b0392530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 5224 bytes
font_01_sfnt_off00011b4a.bin
cef55d2127c64dc4ba2dea3bb18e12437226b636d5d3bf544484c877438c4515		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 11052 bytes

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