Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfee4e5be9a705f8…

MALICIOUS

PDF

77.2 KB Created: 2021-01-21 03:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4708c298c6b4f9ad4233e4891d1b6271 SHA-1: 96ebb2b6f13e7b4dbcc51a0e5796129acef0173c SHA-256: bfee4e5be9a705f878ddcefb629919fb6848c87a12eb1773e5c3f08e1d8225a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan' strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'crack', further supporting the lure of a software crack to entice users to click on the malicious links.

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/aws?utm_term=vcds+12.+12+3+crack PDF link annotation
    • https://site-1176931.mozfiles.com/files/1176931/93315925782.pdfIn PDF document text
    • https://site-1178662.mozfiles.com/files/1178662/tractor_supply_go_kart_tires.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/5d4dc3f.pdfIn PDF document text
    • https://site-1176250.mozfiles.com/files/1176250/gimopiku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f8fa25d95288.pdfIn PDF document text
    • https://site-1218703.mozfiles.com/files/1218703/35204324215.pdfIn PDF document text
    • https://site-1177569.mozfiles.com/files/1177569/72078423034.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_600523fbefccc.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/26f681.pdfIn PDF document text
    • https://site-1166673.mozfiles.com/files/1166673/lucky_mp3_song_downloadming.pdfIn PDF document text
    • https://site-1246924.mozfiles.com/files/1246924/dipatulovole.pdfIn PDF document text
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/fba34bd486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418557/normal_5faf36ba60876.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/gumekosag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lebevinawefebo.rf.gd/rodiwozi.pdfIn PDF document text
    • http://fibotemirazopo.rf.gd/tijezizak.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/herb_alpert_route_101_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/pibepezazuru.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/friends_season_1_script.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/android_file_from_google_drive_programmatically.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_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 5312 bytes
SHA-256: 44c03fb4efd9307a4158480ce6b7b7144b4cdd7ac3827b580a76412422dbbc80
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 10840 bytes
SHA-256: c93ab048e666006b530a983436e3a031eff52884af4d571e61c16e5bfbc33f41

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