Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee50c91f6645d095…

MALICIOUS

PDF

65.3 KB Created: 2020-12-18 20:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 05d1d0a61db171a6d22bd292ea7e2793 SHA-1: 7d7e5102afbee9da8621dd2aa2259d75f9456f49 SHA-256: ee50c91f6645d095b2ece17e307b8812e79c08bf8882156a78cfe70fdcee0512
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains multiple external URIs, including one pointing to 'traffset.ru', which is indicative of a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host numerous links on disposable domains, further supporting its role in a malicious campaign. No scripts were extracted, but the presence of embedded URIs implies an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?utm_term=hall+of+fame+gymnastics+floor+music PDF link annotation
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/8742796.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/df8d9d6be7959.pdfIn PDF document text
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/divimavero_virowi_wapirasezutidat.pdfIn PDF document text
    • https://vemugalibi.weebly.com/uploads/1/3/4/4/134484787/4258733.pdfIn PDF document text
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/cab642a09.pdfIn PDF document text
    • http://floorexpressmusic.com/full-length-demos/CD2604-Hall%20Of%20Fame-Demo.mp3In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09513005-5e41-40e2-98ae-6a1dd65b3c96/nimojuditozale.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4b3df3de5e49b55a76d0/1606372159381/33166530683.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4abfcb3e0f577145a96d/1606372032002/run_chrome_in_safe_mode_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e84a5d-4c45-43d3-b350-7853ac5c6d08/29085861108.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/52035548972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d4adb81-ca0f-4fac-8c2b-1552e22461b1/tyrones_unblocked_games_stick_rpg.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/animestarz_apk_uptodown.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BF 5264 bytes
SHA-256: 54070b0bcfcb51c3145c12e5071038941ef1410138c98a12e5dda7cf1e946fef
font_01_sfnt_off0000d49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49F 10552 bytes
SHA-256: 5b1d862491fc177d6a86d427daf8812134fd81f01d99aef7026d6e2b9c2ea1b3

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