Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08a5656a518c081…

MALICIOUS

PDF

85.6 KB Created: 2021-03-04 19:24:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f95b6476de6888df4ac715179ec67b6d SHA-1: 031915f5cd20ae6f2fd43d556588d217cf85b01b SHA-256: f08a5656a518c081b0dd290b112898c2d1907202e88f6386b222066a06221f88
126 Risk Score

Malware Insights

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

The PDF document contains a high number of embedded URIs, with many pointing to disposable hosting or potentially malicious domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to phishing or malware-hosting sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=el+arte+de+amar+frases+cortas PDF link annotation
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/3242967.pdfIn PDF document text
    • http://mxbur.fun/682880855230yysc.pdfIn PDF document text
    • https://cdn.sqhk.co/lovuzegonu/gdaifqY/bugaxuniwimizarufezim.pdfIn PDF document text
    • http://winoraama.fun/napuvfg6lb.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/tjiiiCG/lubemibevedukazuvugev.pdfIn PDF document text
    • http://closemaze.com/jejawapifevavvw.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/sakumabigenila.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/CjgfDJ9/mavutam.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/zerejibixupav/87976689395.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/5th_grade_common_core_math_review_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/cartoon_love_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/mako_breathe_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/adobe_acrobat_dc_2015_mac.pdfIn PDF document text
    • http://satuzolo.epizy.com/h_name_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/anemia_and_ckd_icd_10_coding_guidelines.pdfIn PDF document text
    • http://robefopatobut.epizy.com/tupawoxisegini.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_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 5124 bytes
SHA-256: 2ea4b79c8784ab7efb03723133d02027ffef01d7ecf2032177c7d1ee5c8d24f4
font_01_sfnt_off0001221e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221E 11580 bytes
SHA-256: f3ba119faf7d096480f8ff5f10fc542fda36b1327bcf3d050eb06b7f124b058e

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