Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11f1a6e055df523…

MALICIOUS

PDF

72.4 KB Created: 2021-01-20 08:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 046a8bc7e27635bcd8c8c81c36b4effe SHA-1: e92118e87509b81787f48187db35574c2b262c24 SHA-256: d11f1a6e055df5239d75bfd282dfa417bf4a58b35e72571a6a48203cd131da0b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs pointing to disposable hosting services, suggesting a link farm or redirection infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a search query, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/123?utm_term=how+to+make+a+leash+in+minecraft+pocket+edition PDF link annotation
    • https://cdn.sqhk.co/vifutetax/ii9hgii/yellow_frog_tape_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/jc2iiEL/colt_super_express_rules.pdfIn PDF document text
    • https://site-1168088.mozfiles.com/files/1168088/american_racing_pro_series_drag_wheels.pdfIn PDF document text
    • https://site-1171771.mozfiles.com/files/1171771/63999812516.pdfIn PDF document text
    • https://site-1181037.mozfiles.com/files/1181037/75362603959.pdfIn PDF document text
    • https://cdn.sqhk.co/vujejanar/qjcGjjK/96018031308.pdfIn PDF document text
    • https://site-1175164.mozfiles.com/files/1175164/moto_x3m_pool_party_level_17.pdfIn PDF document text
    • https://site-1177122.mozfiles.com/files/1177122/xaxutoval.pdfIn PDF document text
    • https://site-1188419.mozfiles.com/files/1188419/events_near_here_today.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/Y5Ri3vH/wind_wings_space_shooter_mod_apk.pdfIn PDF document text
    • http://kabomodom.iblogger.org/98442153491.pdfIn PDF document text
    • https://site-1168175.mozfiles.com/files/1168175/birdies_golf_balls.pdfIn PDF document text
    • https://site-1180410.mozfiles.com/files/1180410/44700371547.pdfIn PDF document text
    • https://site-1172047.mozfiles.com/files/1172047/zobejiralawobog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rubuvajaroxe.epizy.com/seventh_day_adventist_church_manual_2019.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_off0000dbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF3 5512 bytes
SHA-256: 6733768a7f979fb2b2401daf736e3f9838f46ae5fd5af1262956f79c336e0559
font_01_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 11000 bytes
SHA-256: 9d86d124054153cfa40bd147614e287439e3a0af25d8ebfc099ff547285a1324

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