Malicious PDF — malware analysis report

Static analysis result for SHA-256 5482a63717727f23…

MALICIOUS

PDF

76.4 KB Created: 2021-03-03 20:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6f25501c8a73a30712fbfb6c60a2640f SHA-1: 312a99a81fa03ed7c9f7c8529162c75518dca89a SHA-256: 5482a63717727f2375c87a603089bfe8b315b3a58b6f1e1e4b719becf2074f94
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a likely attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=taiga+plant+adaptations PDF link annotation
    • http://regse.website/71909223918l8ise.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/stephen_kings_it_2017_full_movie_watch_online.pdfIn PDF document text
    • http://rukozhop-guide.com/4551284956277rz3.pdfIn PDF document text
    • https://fupiledur.weebly.com/uploads/1/3/4/5/134527701/2149035.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/zemuxad-vojoxa.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/how_much_does_a_semi_mechanic_make.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/60305780595.pdfIn PDF document text
    • http://voicebftyi.com/what_do_contemplate_meanqs3l3.pdfIn PDF document text
    • https://cdn.sqhk.co/zifegowuf/iahchhf/binifun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485010/normal_5ff23ee1c9acf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465010/normal_5feb946e74b08.pdfIn PDF document text
    • http://jonotijero.medianewsonline.com/bijamogumax.pdfIn PDF document text
    • https://cdn.sqhk.co/rorifugera/gg13Rhf/96228136491.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402740/normal_5fec37682e650.pdfIn PDF document text
    • https://cdn.sqhk.co/jovuvufoxet/caOjgOZ/peppa_pig_toys_for_toddlers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473642/normal_601ce02216aa4.pdfIn PDF document text
    • https://rowagikej.weebly.com/uploads/1/3/4/6/134678960/621674.pdfIn PDF document text
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/79868f83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nosigegu.onlinewebshop.net/costco_laptop_dell_precision_m6800_drivers.pdfIn PDF document text
    • http://kilarosine.atwebpages.com/how_much_are_40_inch_tvs_at_walmart.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_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 4980 bytes
SHA-256: c56e88e35db383e0766a28b46b62c4a1457f1901179fba23231b894a7d88160c
font_01_sfnt_off0000ffb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB6 10752 bytes
SHA-256: 425b94279ed73138bfc9dffefd79e2c00b31f9afe0f40a5e0744fabe9ff891c9

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