Malicious PDF — malware analysis report

Static analysis result for SHA-256 d434da3dbea64d5f…

MALICIOUS

PDF

75.7 KB Created: 2021-03-11 03:30:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b3621b1d2e6c5e07138b872a2a3ca3bc SHA-1: 15b66ad06e428c28c704961de279ee30f88aae07 SHA-256: d434da3dbea64d5f9a63568181960188f32ce9ae2eebaf17bc734d5824d726e5
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content. The primary URL, https://mezovuduw.ru/strik, is likely used to redirect users to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=interview+questions+and+answers+for+finance+manager+position+pdf PDF link annotation
    • https://berekiba.weebly.com/uploads/1/3/1/4/131482976/9794254.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/Yhi8hg0/fudemejofepubufax.pdfIn PDF document text
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/ac879cae9.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/v1uEgc7/bovuwodem.pdfIn PDF document text
    • https://cdn.sqhk.co/jalafimimodo/YrA3fbJ/assassin_archer_modern_day_robin_hood_mod_apk.pdfIn PDF document text
    • https://nasupatuvijel.weebly.com/uploads/1/3/4/6/134610874/jujejegu-dakimusilezoban-xokuvinolip.pdfIn PDF document text
    • https://gefobivuvevu.weebly.com/uploads/1/3/1/3/131380717/82d1fc888.pdfIn PDF document text
    • https://fabegobidik.weebly.com/uploads/1/3/1/4/131437275/ronogevorofewesigu.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/hiiggXn/5534367064.pdfIn PDF document text
    • https://cdn.sqhk.co/zumumolebajo/2tbwidn/football_training_equipment_for_running_backs.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/mgiNUia/22_hammer_nailer.pdfIn PDF document text
    • https://nafusulujaj.weebly.com/uploads/1/3/4/5/134596397/risisan_sudizogizi_kunuminexevazir.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/duvusirajador.pdfIn PDF document text
    • https://cdn.sqhk.co/sabumijobude/d3ic53d/7247099375.pdfIn PDF document text
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/819b98.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/fhbalLv/tiratojosubibawuxerotosas.pdfIn PDF document text
    • https://mavitebe.weebly.com/uploads/1/3/1/1/131163983/natodamuzepo_deminujulu_xatudijev_ponupa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/42828094685.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/greek_and_latin_roots_meaning_of_loc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2733292f-9a89-4098-b668-c22df03e9dc4/29190978090.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1410eb5-df2d-479d-8220-1c09158d7292/lords_of_the_sith.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/android_browser_with_manager.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_off0000eb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4E 5660 bytes
SHA-256: 002e27efbe1dfcaf773c6464e08f9f40c11d4f543fff6fa45f657abdaa266c6e
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 10148 bytes
SHA-256: 96ac8d2abeedc35c7c6ce5e2ee9135d0be8ab845fe8c58dce50429a5c32c0a69