Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d0f3ad2a31f0bc…

MALICIOUS

PDF

94.5 KB Created: 2021-03-31 01:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 713f57c8e4d3b60e1157ee947b926985 SHA-1: 7ade29ad7c1016fdb85478f78cf8cce2879d0112 SHA-256: 42d0f3ad2a31f0bc0122ab5c58a7f4558b0a0cfe92bdccd72792de5e63f2d182
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation tools and potentially keywords intended to mask its malicious nature.

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://golowaki.ru/strik?utm_term=gopro+hero3%252B+manual PDF link annotation
    • http://sevowina.medianewsonline.com/3dplm_aptitude_questions_2020.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/ligisorubod.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/17272953933ku27l.pdfIn PDF document text
    • http://cesaregaspari.com/traffic_and_highway_engineering_5th_edition_garberhqz4a.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/cjaDRgi/warframe_defense_without_damage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384650/normal_603413f03c34c.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/5Njfijy/74109789439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382962/normal_6051b5af16414.pdfIn PDF document text
    • http://lozhobelir.space/schwinn_airdyne_ad3_consolev1d67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487184/normal_5fe344bf67d63.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/sacred_marriage_gary_thomas.pdfIn PDF document text
    • http://nubuxeki.scienceontheweb.net/fssai_answer_key_2020.pdfIn PDF document text
    • http://kdghy.online/dynamic_tension_charles_atlasn70wx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_00d10cfb92df4ea282c486dc3e87d7fc.pdf?index=trueIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_c3d78648564e42b086ddc57e3c450c45.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_9035220297cd442cbaa9c900039736a8.pdf?index=trueIn PDF document text
    • http://sofidusujewa.epizy.com/aqualink_rs_onetouch_troubleshooting.pdfIn PDF document text
    • http://nexuvojof.epizy.com/gilefubafoturajas.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 5076 bytes
SHA-256: 43da1571d04dc5a8ab9bf8aa1083303a64acae18209b1c436e6dc6b4191194b6
font_01_sfnt_off00012fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB9 11664 bytes
SHA-256: 4966c5ef9c4352b9c15f1843c02907773c6cea70737bc59ee2cab7191d78fae2
font_02_sfnt_off000157d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157D1 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210

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