Malicious PDF — malware analysis report

Static analysis result for SHA-256 f05df1bb4de9ddff…

MALICIOUS

PDF

79.7 KB Created: 2021-02-17 20:30:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 45c0663b79f339963bd452f0e74683c0 SHA-1: a07083f57b653ab34b7250fa306d0797e3c8d232 SHA-256: f05df1bb4de9ddffdc7a5f55b8aecae435d39b3301b58fd7d0dc0d1a94ba4ae5
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to various PDF documents. The document body, though heavily obfuscated, contains references to 'Lenovo t420 windows 10 drivers', suggesting a lure to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/strik?utm_term=lenovo+t420+windows+10+drivers PDF link annotation
    • https://jebunofom.weebly.com/uploads/1/3/4/4/134468214/wisil.pdfIn PDF document text
    • https://zodekunomaxuj.weebly.com/uploads/1/3/0/7/130739112/4817286.pdfIn PDF document text
    • https://cdn.sqhk.co/kegetaxob/R5DUv6H/traffic_road_signs_meanings_philippines.pdfIn PDF document text
    • https://zawevujavesid.weebly.com/uploads/1/3/2/8/132814930/ripipobasax_rudofop_pusuwa_buxuzugurexara.pdfIn PDF document text
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/96441.pdfIn PDF document text
    • https://cdn.sqhk.co/fusaduxuw/jehcjgf/duwirove.pdfIn PDF document text
    • https://nawenakugod.weebly.com/uploads/1/3/6/0/136048640/205fcfb39f4512.pdfIn PDF document text
    • http://duwadomet.22web.org/18645710887.pdfIn PDF document text
    • http://naturalm.space/26645944501if3jl.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/jiehbjb/fudoxupasulen.pdfIn PDF document text
    • https://pebetojakudasud.weebly.com/uploads/1/3/4/8/134879391/f102df.pdfIn PDF document text
    • https://foguvebosep.weebly.com/uploads/1/3/5/3/135315209/097d3c.pdfIn PDF document text
    • http://lefefegibilapo.22web.org/pepejewejos.pdfIn PDF document text
    • https://cdn.sqhk.co/xurajalijok/ePCjjja/superhero_fruit_2_premium_robot_fighting_mod_apk.pdfIn PDF document text
    • http://levinorutuw.iblogger.org/limarijilotojal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pexevogawi.epizy.com/best_spy_video_recorder_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/kofefiwavufarorexuvefa.pdfIn PDF document text
    • http://webidiwotew.epizy.com/29156777303.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/89370206960.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_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 5084 bytes
SHA-256: 9a1b1e78ac51da07100bf20951bb3377080150c5a1d1f64221b92d05825bdfb7
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 11976 bytes
SHA-256: 1d933dddbffcf3016e178d2cf19396620c15620bf8ed0efb67b70465115fc8b1

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