Malicious PDF — malware analysis report

Static analysis result for SHA-256 344a0c8da01ff3fa…

MALICIOUS

PDF

92.1 KB Created: 2021-04-05 13:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f78619753d5cfff9bfe1cdaaf5cf862 SHA-1: 9f955ab4bcac459067c059e0dd449ded8ad39e55 SHA-256: 344a0c8da01ff3fa587410a8436f90b5251003cbb2cbc5f692a9585d51657275
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is https://jumiwimov.ru/award?keyword=jesuitas+en+mexico+pdf, which is likely used to redirect users to further malicious content or phishing pages. The document body is heavily obfuscated and unreadable, but the presence of numerous external links strongly suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=jesuitas+en+mexico+pdf
    • http://nefritthebestthing.site/91581705494cvmza.pdf
    • https://fakokawiloduku.weebly.com/uploads/1/3/0/7/130775735/sunenowa.pdf
    • http://doweryklkq.space/cuanto_son_8_mm_en_pulgadasyyv3z.pdf
    • https://lugigotaxur.weebly.com/uploads/1/3/0/9/130969655/vefunexel_xuwapuki_lemitovulef_wateliw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dofadedivuxira.rf.gd/gasubudurabaloxanujafek.pdf
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_25437fe9d15c42b9862296c37a5186f3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f0660d18-9e9f-4141-b287-38208eb729df/vipajakikat.pdf
    • http://nisuzadusidu.epizy.com/benexutazixirifotad.pdf
    • https://uploads.strikinglycdn.com/files/0c591578-6c7d-4b10-9382-217db6f9d394/casio_fx-115ms_manual.pdf
    • http://dogefifuga.rf.gd/andhra_bank_home_loan_application_form.pdf
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_fa4739d2c2974bcdb54733f60a5a1adc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e86728b5-aefb-4206-a9e6-074b0686747c/15100801503.pdf
    • http://difofeb.epizy.com/l_amandier_au_maroc.pdf
    • https://f2fffe36-c7b4-4b88-9608-518dc6c14750.filesusr.com/ugd/950b2a_a916bd51c9d84a4a9d6951e74088f474.pdf?index=true
    • http://toberijalija.rf.gd/aha_blood_pressure_measurement_guidelines.pdf
    • http://tuzivapevof.epizy.com/antimatter_black_market_enlightenment.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127e3.bin
a8154bc16440f46e9169ed993fb2620ae859726ec91398cecee7444a8c292fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 5232 bytes
font_01_sfnt_off000139a9.bin
ec2e5a836bab74656a5bffda60056b03dae9753b5f7d2587ee796fa16237444b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139A9 12512 bytes

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