Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9853bf851d4d624…

MALICIOUS

PDF

80.8 KB Created: 2021-02-18 23:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fd0cca91cd6e054062938a9be2557bc SHA-1: 7dd73bb74d99d61a4acd35821fbb7543b6e56d32 SHA-256: f9853bf851d4d624c640ed015730604a8406bc1884ab8b1f8e2095bab7c57236
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 as a link farm, which is a common tactic for SEO manipulation and redirecting users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=waterpik+water+flosser+charging+time
    • https://wodanosivowifig.weebly.com/uploads/1/3/4/5/134593279/kexugupefaxur.pdf
    • http://potolkilife.ru/tes_branche_2_textbookrqff8.pdf
    • https://cdn.sqhk.co/xexanodu/eLdgcoO/23934975699.pdf
    • https://cdn.sqhk.co/pejozujemu/f1hghe1/microcosmum_survival_of_cells_apk.pdf
    • https://cdn.sqhk.co/bamosabubesi/cHK6MNc/sportage_extreme_offroad_drive_modern_sports_cars.pdf
    • https://cdn.sqhk.co/rudixika/jhioCdL/lolaxut.pdf
    • https://cdn.sqhk.co/soboxuxafiso/YYjizjg/dozidawifono.pdf
    • http://wilozobugo.iblogger.org/bitixili.pdf
    • https://pimakesoxokozo.weebly.com/uploads/1/3/4/0/134041299/ruxisusebemadog.pdf
    • https://cdn.sqhk.co/momewoziwoge/jcjaOie/kunakowobasepusitid.pdf
    • http://rabisoluvilava.iblogger.org/odia_bhajan_gita_video.pdf
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/c1ca79ffc82b8.pdf
    • https://cdn.sqhk.co/zukasedu/d4iFDqg/futokakizoneto.pdf
    • https://cdn.sqhk.co/noxomosanena/N3igjfb/rapunzel_movie_summary.pdf
    • http://trendmobile.ru/liniwaxoxekof3prak.pdf
    • https://cdn.sqhk.co/sudidoxa/YjcYjax/kuledaguz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://denefarow.rf.gd/bill_of_rights_worksheet_high_school.pdf
    • http://mevomum.epizy.com/66797344812.pdf
    • http://kidojudal.epizy.com/bomb_squad_game_apk.pdf
    • http://bunokupisosep.epizy.com/pitobidamiwatozelefoniniw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c7.bin
675719c9cd7fcd84a28a388fab9723fe96303f39d0fb7b20a1116b009b2cb0d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 5388 bytes
font_01_sfnt_off000102fe.bin
e507a4f2158166e1dc9febf23bbd71371500305d96f707322be52bfa29f5bc4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 10788 bytes
font_02_sfnt_off000127b9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127B9 4324 bytes

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