Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2037fd10f3b2b60…

MALICIOUS

PDF

77.7 KB Created: 2021-04-08 10:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 44a75ae56e4ec508c4bc2ce6a849b19b SHA-1: acd67dacade172a0ddbdfe32f63620a69b2ef8ea SHA-256: d2037fd10f3b2b60c169fe6985b853e692d61f57936a62de819ced678eea1ffd
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with many pointing to disposable domains and employing UTM parameters, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/strik?utm_term=piano+adventures+christmas PDF link annotation
    • http://rukafijawidataw.iblogger.org/appropriate_preposition_download.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/50584673533.pdfIn PDF document text
    • http://dorutote.scienceontheweb.net/modele_attestation_d_employeur.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/vjgJfhj/call_of_duty_mobile_striker.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/Kgejcha/42018411902.pdfIn PDF document text
    • http://fesilax.22web.org/why_is_my_whirlpool_fridge_not_cold_enough.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/icZgcdW/wowamilapexivosasabato.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/iejdhir/commercial_free_70s_radio.pdfIn PDF document text
    • http://leomannapov.com/ruger_lcp_2_review_hickok45ue9jx.pdfIn PDF document text
    • http://pigalimiru.medianewsonline.com/how_to_work_with_a_sign_language_interpreter.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/49218154932.pdfIn PDF document text
    • http://jorodija.iblogger.org/jasitigage.pdfIn PDF document text
    • http://nokilibetajew.mywebcommunity.org/fivimazadazod.pdfIn PDF document text
    • https://cdn.sqhk.co/podogule/jghdMig/cyberdunk_2_basketball_manager.pdfIn PDF document text
    • http://poopo.ru/fafagawamapibusotiphldv0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xulitapaxi.rf.gd/zafamekolituvukebawenodat.pdfIn PDF document text
    • http://xuvufajozurez.rf.gd/gedowik.pdfIn PDF document text
    • http://sarigeselos.epizy.com/asme_y14_5_2020.pdfIn PDF document text
    • http://gubadif.myartsonline.com/mutabusaxinav.pdfIn PDF document text
    • http://xidalagep.myartsonline.com/71546912905.pdfIn PDF document text
    • http://dexidije.epizy.com/acute_myocardial_infarction_icd_10_guidelines.pdfIn PDF document text
    • http://tatikipebufufa.epizy.com/romojupodij.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3C 5088 bytes
SHA-256: fc36ea169c549bdeb5b4018710d12f3f454fbfd6cd8d2153e5d63bec3316dc06
font_01_sfnt_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 10884 bytes
SHA-256: e938b06266ff5cdd3eeeef2f1346399df67eb2383e711e78f52fd95c9c3f45c3
font_02_sfnt_off000104f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F4 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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