Malicious PDF — malware analysis report

Static analysis result for SHA-256 b723ec583883ce10…

MALICIOUS

PDF

68.4 KB Created: 2021-02-09 19:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fdfa66de770d1a9ae798e78c5447fed6 SHA-1: 3b52dc87baa7bf8ca35a49668829c407ebbe3a7b SHA-256: b723ec583883ce102e092e4304d73fa7ce0c1ad9227f8717850dbbd49f298097
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, forming a link farm. The document body, though heavily obfuscated, suggests a lure related to "Spotify apk android 4". The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wb?keyword=spotify%20apk%20android%204 PDF link annotation
    • https://cdn.sqhk.co/fedelubu/kZheH7W/47570522142.pdfIn PDF document text
    • https://marodesama.weebly.com/uploads/1/3/5/3/135349202/roteju.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/jegehgx/draw_master_matter.pdfIn PDF document text
    • https://burerekubexu.weebly.com/uploads/1/3/1/3/131381452/wirad_sikigafenej_safopuxedamopu_girixoz.pdfIn PDF document text
    • https://zigajimimokok.weebly.com/uploads/1/3/1/3/131383588/budumeti.pdfIn PDF document text
    • https://liwifaxuje.weebly.com/uploads/1/3/0/8/130874244/5636247.pdfIn PDF document text
    • https://cdn.sqhk.co/motuvitewodi/OgjRSha/24754768075.pdfIn PDF document text
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/4be64f1.pdfIn PDF document text
    • https://cdn.sqhk.co/wijenipa/g3uxbhe/78341078740.pdfIn PDF document text
    • https://nadebexipopajin.weebly.com/uploads/1/3/4/6/134678264/4841034.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/IMnJIgg/wunumajogifobo.pdfIn PDF document text
    • https://worizura.weebly.com/uploads/1/3/1/4/131437573/6055608.pdfIn PDF document text
    • https://pedadadaroteb.weebly.com/uploads/1/3/0/9/130969242/lurajalu_xegitukudabo.pdfIn PDF document text
    • https://cdn.sqhk.co/tijovomiv/hiijdha/82530097325.pdfIn PDF document text
    • https://cdn.sqhk.co/wejideduv/ehjigjg/mastermind_south_movie_cast.pdfIn PDF document text
    • https://butadagawonor.weebly.com/uploads/1/3/1/0/131070306/4683513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_5fd3b1f1630bb.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/mogedozara/12911478569.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/66172690224.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/christmas_music_clarinet_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/kopopalafapogagameg.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_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 5184 bytes
SHA-256: c024733260a805da4d890588e3deaf9a879f4e8d226b39074a97a373dbc87c96
font_01_sfnt_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 9924 bytes
SHA-256: 31c09cc9510751ed6de76c9f44983fcc037d2f9beb020af59fcf3520366fcc5d