Malicious PDF — malware analysis report

Static analysis result for SHA-256 811b881a716e29a7…

MALICIOUS

PDF

85.3 KB Created: 2021-04-11 15:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 56ec9ca5e13a92f5a66d364ec84277ca SHA-1: ebc898ff6cd49b311887f2552a7614e4a814f56c SHA-256: 811b881a716e29a7eca83c4b8bbc3d04336716adb1b19c238b36f71bfd94b3d2
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

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://dugedepap.ru/strik?utm_term=nextbook+flexx+11+audio+drivers PDF link annotation
    • https://narosixepitifon.weebly.com/uploads/1/3/5/9/135960882/jupagupafikazezel.pdfIn PDF document text
    • https://lugilabujenubo.weebly.com/uploads/1/3/4/3/134320616/a028f49f1.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/kolovuj.pdfIn PDF document text
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/vuvat-suwele-fomaragorilolu-wofawokikabone.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/hPiheLE/4888423604.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/3iejejj/4499599435.pdfIn PDF document text
    • http://spindlndou.space/how_to_do_a_self-appraisal_forminbzl.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/4qkTgeO/terra_mystica_strategy_mermaids.pdfIn PDF document text
    • https://sifegofariwe.weebly.com/uploads/1/3/1/4/131437131/9228233.pdfIn PDF document text
    • https://mimidozeze.weebly.com/uploads/1/3/4/3/134357816/pelerozenajaka_likorixevoze_volejiraje.pdfIn PDF document text
    • http://koreanluxe.com/giwuputalelojukd765.pdfIn PDF document text
    • https://wijisozafepu.weebly.com/uploads/1/3/4/3/134356417/5059714.pdfIn PDF document text
    • https://kodalogodo.weebly.com/uploads/1/3/4/7/134753778/lopuxikag.pdfIn PDF document text
    • https://pawagidi.weebly.com/uploads/1/3/1/1/131164052/7550606.pdfIn PDF document text
    • https://wufipalowev.weebly.com/uploads/1/3/4/5/134595621/futale.pdfIn PDF document text
    • https://cdn.sqhk.co/motulobugaji/jihU0MB/23699507958.pdfIn PDF document text
    • https://ruxibotululag.weebly.com/uploads/1/3/1/4/131408142/seveser.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 5252 bytes
SHA-256: df43cd7d9d990f3cbcc512e88165fbd2d89d79ae83555a813ba264d66f22f622
font_01_sfnt_off00010c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C32 10768 bytes
SHA-256: 19beb4ae2de1ef737e0e490dd2a1088449c499e3b70b8bfe95e95827a0f21b71
font_02_sfnt_off0001310a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310A 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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