Malicious PDF — malware analysis report

Static analysis result for SHA-256 16aee37e52fde262…

MALICIOUS

PDF

93.6 KB Created: 2021-03-21 11:02:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dc07c0a5846e1bf51d5a072c7aeab9a SHA-1: d148fd32d82dfa9d503c48857eee46eab7c839e3 SHA-256: 16aee37e52fde262da40617f4cb8109bf1253771076091c89352d97c28fcc4ad
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The embedded URLs point to various PDF files and potentially malicious content, indicating an attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://pelibifir.ru/strik?utm_term=what+episode+is+ahsoka+tano+in+the+mandalorian
    • http://sokokusulamubi.22web.org/dokijutowu.pdf
    • https://fabexitib.weebly.com/uploads/1/3/4/1/134109013/sunivuvodewini.pdf
    • https://gufekibeliwu.weebly.com/uploads/1/3/1/3/131382841/a671ab1.pdf
    • https://cdn.sqhk.co/parikozug/bicjgqc/insatiable_io_snakes_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4464735/normal_600510f8a2cf2.pdf
    • https://cdn-cms.f-static.net/uploads/4375207/normal_602ea599c01bd.pdf
    • https://cdn.sqhk.co/guvevifowo/jgjfjbM/91015003453.pdf
    • https://bubijusafas.weebly.com/uploads/1/3/5/9/135994311/bemuj.pdf
    • https://cdn.sqhk.co/vutenugade/dhjY9E4/25545864515.pdf
    • https://bitigufej.weebly.com/uploads/1/3/5/3/135337089/tezela.pdf
    • https://cdn.sqhk.co/pikuresob/hhEPihB/paxesavol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_8fed514dc2174b14b5bfa0803f3dd066.pdf?index=true
    • http://joriboka.epizy.com/88752620826.pdf
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_a0e1c96841a34a0da417e983e30904b0.pdf?index=true
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_d7bb09f910a749c9a1d1996bb8347a76.pdf?index=true
    • http://zozikidifalov.epizy.com/redupofuliwusowixef.pdf
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_30a4a8425d85479ea8f9da19b910736f.pdf?index=true
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_559a9150936f4bd38e3d275a6d31bb52.pdf?index=true
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_d70a6f6453ed43da9c1fad5a0751190d.pdf?index=true
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_b640de9dc7824d4da98ad485e480b9ed.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e2d.bin
bc141c1225387e118c5fdf37fa2c7d2a4aa0f5ccb6d0e4f769836f36d7281225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 5276 bytes
font_01_sfnt_off00013ff7.bin
9ec25fcb8fb24b1e7665d92beedd564f0b76aeb23955acc3826ca7b57be054d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF7 12052 bytes

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