Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a6c49a9f937735…

MALICIOUS

PDF

76.5 KB Created: 2021-02-19 07:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 65ef2508a39c853a5234779bf60ded07 SHA-1: 3ffb4fa89b26692455eb4f39039871bb79c1969b SHA-256: 16a6c49a9f9377351cefdb474c1263cdb26149df5e04ddac5ff4acac7115a3e8
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. The document body, though heavily obfuscated, contains text related to a 'Supersonic tablet reset manual' and references wkhtmltopdf, suggesting a lure. The presence of numerous external URIs, many pointing to disposable or potentially malicious domains, reinforces the phishing and malware distribution intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to distribute malware via link farms.

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://leonvi.ru/wix?keyword=supersonic+tablet+reset+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468255/normal_60130f656c1e9.pdfIn PDF document text
    • http://gaydating.world/tiwevinigarozf3uq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5fe6b315a70f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_600d226691fe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_6019a178ba182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491169/normal_600f596ead7e1.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/sling_blue_cost9ha4o.pdfIn PDF document text
    • http://bet-info.ru/stock_market_simulation_games_online_freenp0bj.pdfIn PDF document text
    • http://pearhaidhr.fun/how_to_update_zoom_on_ipad8lpv5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_5feaedf976d97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369648/normal_5feebdca8db21.pdfIn PDF document text
    • http://udilische.club/instagram_chat_online_on_laptopgdokg.pdfIn PDF document text
    • http://freefire-gifts.com/167227966723hsbx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xujekodade.epizy.com/jikafow.pdfIn PDF document text
    • https://s3.amazonaws.com/vojapu/discrete_wavelet_transform_in_image_processing.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/dusulegam.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_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 5324 bytes
SHA-256: 3b706107bf9fe38ba42af163a30e6f5ef04ab43e088642e3e2b28fd85f44d2bd
font_01_sfnt_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 10852 bytes
SHA-256: 33721e453348214662eab49a7d0f30a346e235fab9b5d37bdff57285ca217a4c

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