Malicious PDF — malware analysis report

Static analysis result for SHA-256 96701510c32ef5c6…

MALICIOUS

PDF

73.3 KB Created: 2021-05-02 14:40:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6cfeb4a4b5d087b215bea7bcd11e9524 SHA-1: 93a1c1ff9dc538920764adf1fc1c50728ad0fca6 SHA-256: 96701510c32ef5c637e5449323f23ff20ae01136e5bd9cd2e4e757bfd41a04c5
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with the primary URL being vilenefex.ru. This heuristic, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a 'sat reading practice test'. No scripts were extracted, but the PDF structure itself facilitates redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=sat+reading+practice+test+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478415/normal_6060695ce1e0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fdfeeb360e6b.pdfIn PDF document text
    • https://jidisoluko.weebly.com/uploads/1/3/6/0/136097174/4bddfb96c419e45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_603f433a1bf54.pdfIn PDF document text
    • https://deziledage.weebly.com/uploads/1/3/4/3/134339849/6a049c33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_60443d60e4b50.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/b3b92d0501326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_60512449369cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413019/normal_5fddc08cd5b97.pdfIn PDF document text
    • http://mibamixuxonewu.22web.org/96163764478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469128/normal_600b6a5da42dc.pdfIn PDF document text
    • http://fringigejy.site/paper_plate_on_head_christmas_drawingjw8ja.pdfIn PDF document text
    • https://senekuzoje.weebly.com/uploads/1/3/5/9/135978249/5793308.pdfIn PDF document text
    • http://hamsterbig.com/623719811767elv9.pdfIn PDF document text
    • http://blaugrana.ru/92349544790pcei7.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/fasudikek/sawevoto.pdfIn PDF document text
    • http://tibugesifavetel.epizy.com/kofovisogidozo.pdfIn PDF document text
    • http://nagikesedogoru.rf.gd/xodajukiz.pdfIn PDF document text
    • http://zapudeni.epizy.com/ashes_cricket_game_apkpure.pdfIn PDF document text
    • http://bedigetulo.epizy.com/36328526763.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/giverirevavematuxumezisa.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_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 5584 bytes
SHA-256: af0ec8f1d739af9ffc1e3261db38a2b06c314aaedf31ddb5715a9a580b76e2c3
font_01_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 10624 bytes
SHA-256: 961e27d25b9d9309df8ecf255ffb89bc9050e2792aba77a6d0717152f81e937c

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