Malicious PDF — malware analysis report

Static analysis result for SHA-256 64656b616a8c661f…

MALICIOUS

PDF

75.7 KB Created: 2021-02-21 05:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 39938f6c68bd3fe9530bda493f680b7c SHA-1: 47a05f5d78c2d044e5343bb60bd64e18b537840d SHA-256: 64656b616a8c661f614d738cc05058f796b3c3f270d659ec61e35969b05f37e6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful websites.

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://druttle.ru/strik?utm_term=does+keto+pure+diet+pills+really+work PDF link annotation
    • https://pogizufibedisiw.weebly.com/uploads/1/3/1/6/131606284/7272640.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidatoxo/eCiggjB/selisawonopiwokuzik.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/7cdc68a143b.pdfIn PDF document text
    • https://gepajalubawif.weebly.com/uploads/1/3/5/3/135326746/sinimikubejuluni.pdfIn PDF document text
    • http://help-mediasupport.com/oppositely_charged_ions_formrlgnv.pdfIn PDF document text
    • https://cdn.sqhk.co/nanubebebot/Ohh5jdV/30748691680.pdfIn PDF document text
    • https://gedepavo.weebly.com/uploads/1/3/5/3/135391693/73d84a.pdfIn PDF document text
    • http://sowivonowiso.iblogger.org/dujukekofib.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/3ajfibS/rasemulebudaxedonow.pdfIn PDF document text
    • https://fijuzezakuxulow.weebly.com/uploads/1/3/5/3/135391315/258cba7d0e2a8f.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/9797646.pdfIn PDF document text
    • https://cdn.sqhk.co/dupamotim/Xgiha1W/weekend_update_saturday_night_live_hosts.pdfIn PDF document text
    • http://tokigarodam.22web.org/77567703257.pdfIn PDF document text
    • https://nedalejurozawo.weebly.com/uploads/1/3/0/7/130776692/9049730.pdfIn PDF document text
    • https://munefetuwavebif.weebly.com/uploads/1/3/2/6/132683017/vexidemew.pdfIn PDF document text
    • http://velesvoyage.ru/test_drive_unlimited_2_trainer_cheat_happensmfuw4.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/9093699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://felixoxajaxev.epizy.com/what_is_the_exposition_of_by_the_waters_of_babylon.pdfIn PDF document text
    • http://kagufunoziwezu.epizy.com/sheet_metal_laser_cutter_for_sale.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_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 5208 bytes
SHA-256: e604ef6dd64b94f77135e5d03a9a8b06218a35538e705112fc77e32655e080dc
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 10472 bytes
SHA-256: 7997b153ea67ba3ef935c685c4316ee1fb377e59f616915fd150959cbff81f3f

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