Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fa81b948461e3f…

MALICIOUS

PDF

73.8 KB Created: 2021-05-27 07:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f5f846c303727293349caefd0262f641 SHA-1: d40f974553e51c451bb3515d97bd1a0291b198cf SHA-256: 71fa81b948461e3fac55d2303ea29d283491d18937e6cbabb4413ba6bd32cad6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm. The primary URL, https://mezovuduw.ru/strik, is likely used to redirect users to malicious content or phishing pages. The document body, though heavily obfuscated, appears to be a lure related to legal terminology.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=what+is+meant+by+obiter+dicta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419633/normal_60310ae8593da.pdfIn PDF document text
    • https://kezorida.weebly.com/uploads/1/3/5/3/135330530/0b695c91d.pdfIn PDF document text
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/fakaxujulafufirozivi.pdfIn PDF document text
    • https://warororob.weebly.com/uploads/1/3/5/3/135314520/wusal.pdfIn PDF document text
    • https://nimujebiparifil.weebly.com/uploads/1/3/4/7/134730121/rebibovemesexepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_600a21f1de1b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388178/normal_600e8a9a0f4c9.pdfIn PDF document text
    • https://vugosolisaxude.weebly.com/uploads/1/3/2/8/132814967/8102528.pdfIn PDF document text
    • https://gixoxiri.weebly.com/uploads/1/3/4/7/134707295/1045434.pdfIn PDF document text
    • https://domafotenok.weebly.com/uploads/1/3/5/9/135973376/sanejutu.pdfIn PDF document text
    • https://wexapifunoru.weebly.com/uploads/1/3/4/7/134715363/d1ac10f9e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5fd266f3a365c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_60683e4f38a00.pdfIn PDF document text
    • https://pugixodazujok.weebly.com/uploads/1/3/2/7/132710779/kedadorifanisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527902/normal_5ff57f533cfef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88fe9c81-a332-4a3a-a209-7b5442115aea/34857872899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff279b5-6965-4931-9bb8-0cb829253ac7/how_to_google_search_for_an_image.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0a0a00-7fe0-4cc0-86f6-a63a4b03f1a0/midnight_sun_chapter_13-24_indonesia.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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 5400 bytes
SHA-256: 7ffdea0372a6d52e113966fc973225b1b97a4b268d355c575d9737a2a503e2a7
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 11252 bytes
SHA-256: ab178ef3899254c453ff5e6b59fd3d1f433422ef28a7e676ad3fe78522740135

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