Malicious PDF — malware analysis report

Static analysis result for SHA-256 e068660bf0090258…

MALICIOUS

PDF

77.0 KB Created: 2021-03-19 14:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 4e6442c89bb7e329d777d14eedb9c0bc SHA-1: 5fe9ddf16e1e466d522f647bbdbb197ea15b9635 SHA-256: e068660bf0090258e36fb2623b523583e2b2835ff349aa8ada088aa4375f6035
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('jumiwimov.ru') that is likely part of a phishing campaign. The document body, though heavily obfuscated, suggests a lure related to technical documentation, which is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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/award?keyword=mecanismo+biela+manivela+pdf PDF link annotation
    • http://linza.media/97467864498k32pr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fdddcd139243.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/ZIolijE/electrical_apprentice_jobs_in_houston_texas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5ff42cd510162.pdfIn PDF document text
    • http://raisinshub.club/how_does_scale_measure_bone_mass8yz88.pdfIn PDF document text
    • https://cdn.sqhk.co/suwefememe/jO4ajju/ap_chemistry_exam_2017_free_response_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_603c5d5256186.pdfIn PDF document text
    • https://cdn.sqhk.co/nuxarufodir/PrjbQml/tarewawekoneluwo.pdfIn PDF document text
    • http://buylettersonline.com/kuta_software_infinite_algebra_2_radicals_and_rational_exponents_answers3qjv9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_603d05c94b958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383791/normal_5ffbf2adbd7ac.pdfIn PDF document text
    • http://sendgrid-de.com/foord_balanced_fund_fact_sheet_20181pleg.pdfIn PDF document text
    • http://sell-toclick.online/animal_kingdom_class_9_notesu6ji9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fdf9828-7975-4950-a57d-838b876e9863/60404389383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc15db4-8ebc-435e-8f51-41a2942080eb/34982274799.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8495a55-274b-4905-9131-ddcbaf486dd0/how_to_install_liftmaster_garage_door_opener_keypad.pdfIn PDF document text
    • https://5c06e36d-e6a7-492f-989e-88f86e9ca1b1.filesusr.com/ugd/c9ae65_a9ab19276b6c4939a0d325a3471b60b9.pdf?index=trueIn PDF document text
    • https://f6b99bba-f064-431f-ab68-6eacb91b2703.filesusr.com/ugd/35e1ce_5e5c37f0536244d0b34ecc6beb323a20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48d02c05-2422-46b2-bd80-aabc9ebab66c/17946890447.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/does_dell_optiplex_790_have_hdmi.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_a33936e7bd8f43d39d7efa27f48968d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/bibliographie_commente.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_6c03f53c05b04265a07859712cd17238.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e81a3c-1a6c-4fad-b54b-ee1a3b134381/safije.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/xugedifutajuwawumavus.pdfIn PDF document text
    • https://8546b567-499d-44cb-812b-f4cb210fa0cc.filesusr.com/ugd/1f0b74_baa535c909e1464aa1490705d7536a38.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/sierra_tipped_matchking_308_load_data.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_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 5412 bytes
SHA-256: 200b920ad663fe9e40c4f4a2a5f0596992a6abaec67a6de650b59286be7f1a4b
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 12168 bytes
SHA-256: 4daa94db4465ee4501b932a361f9e88d18ed0b64cf55a523fc84482708bafc19

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