Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16497b59b32583f…

MALICIOUS

PDF

78.2 KB Created: 2021-02-12 04:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 35852056a8230add29f3f46eda8b7ef9 SHA-1: e474298fcb39d30dd27100208462aa25fabd4eb4 SHA-256: a16497b59b32583fbee545b77e27d3b02d82ba2f1c2fbf70715b34e2b38a63a5
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

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/123?utm_term=rebel+without+a+crew+audiobook PDF link annotation
    • https://rajarajo.weebly.com/uploads/1/3/1/3/131398110/pozexafoxi.pdfIn PDF document text
    • https://tuzopukerokep.weebly.com/uploads/1/3/5/3/135347688/furozoximarorok-nojadekiti-tudeperutope.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/jekn08J/blaupunkt_bluebot_xpower_robotic_anleitung.pdfIn PDF document text
    • https://likojekiputisi.weebly.com/uploads/1/3/4/5/134576895/2df35.pdfIn PDF document text
    • https://vilamewu.weebly.com/uploads/1/3/0/7/130775649/vunonawajipabit_weduliguk_wotedojuwuvanux_dirarenuwunuvi.pdfIn PDF document text
    • https://vugevosuza.weebly.com/uploads/1/3/5/3/135328642/5494530.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/27d188fe27add8c.pdfIn PDF document text
    • http://tamakar.xyz/average_cost_of_invisalign_with_insurancez981e.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/0fac9e3.pdfIn PDF document text
    • https://jibogikufojubu.weebly.com/uploads/1/3/1/4/131438018/sesato_zuvaleb_wopadupu.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/topap.pdfIn PDF document text
    • https://wilukogata.weebly.com/uploads/1/3/5/3/135388132/7c2f0a48.pdfIn PDF document text
    • https://samazixudoreput.weebly.com/uploads/1/3/2/6/132681586/zasepujijalevi-ribufudixolur.pdfIn PDF document text
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/fagufalax.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/nixedov-duzugam-jerut.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ritarejameja.epizy.com/android_assets_folder_not_found.pdfIn PDF document text
    • http://jabaxuzadowepep.rf.gd/weather_report_for_gaylord_mi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 4928 bytes
SHA-256: 8e7b9d4388f888e3467fc95a9049d3b5e7a504de1daa8abd1cb4ff0d5dabc500
font_01_sfnt_off0000fb84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB84 10052 bytes
SHA-256: 6be3245f973a80ca2e9ec950476dc58f78d9541f9d770fe67166ff69cffed7a7
font_02_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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