Malicious PDF — malware analysis report

Static analysis result for SHA-256 b428a5a114bf8ba6…

MALICIOUS

PDF

73.8 KB Created: 2021-03-17 19:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3be11e804a0c66c8116c800e860ec42 SHA-1: 203b273d2ac7689db8ed9fb04c3361679ab1ded8 SHA-256: b428a5a114bf8ba64b85e53ba46d7bf628ce3c7bf038320c563c29fd521a724e
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'zajinet.ru', which is likely used to redirect the user to a phishing or malware download site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external URLs strongly suggests a malicious intent to redirect the user. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=magic+mouse+review+2020
    • http://getveran.site/cbse_net_july_2018_cut_off9ajoj.pdf
    • http://bcpzonasegur4viabcp.com/honda_hrx217k5vka_australia8wvwh.pdf
    • https://cdn.sqhk.co/kurapobal/JUgijbd/e_l_pet_insurance_continuation_claim_form.pdf
    • https://cdn.sqhk.co/xugosovemi/h6jjRUQ/football_referee_salary_champions_league.pdf
    • http://casser.xyz/16371388300630ei.pdf
    • http://strgb2.ru/what_is_the_difference_between_maoism_and_marxismjf3bt.pdf
    • http://meine-gebuhrenfrei.com/kitsound_boombar_pairing_instructionsej9yh.pdf
    • http://rabota-plus.club/how_much_does_app_development_software_costa9yfr.pdf
    • https://cdn.sqhk.co/dikizumi/hjdjevZ/daxifujoledezov.pdf
    • https://cdn.sqhk.co/xenumobavun/iborKgi/runeremajalavakuwad.pdf
    • https://cdn.sqhk.co/vakamuzawa/bhijifA/il_vello_d_oro_taormina.pdf
    • https://cdn.sqhk.co/kozutani/MiiBUia/7653562410.pdf
    • http://testertumentum.space/giziselitvwxum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_4c3398bc310248ba953cf1e9006ade68.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b5350ea6-8beb-4f9a-a227-c6480969e5ac/what_is_another_word_for_a_few_things_to_do.pdf
    • https://uploads.strikinglycdn.com/files/5f43c2e1-0a51-41e9-a3c6-1f89687a102e/68818078270.pdf
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_0a06d7e323b34fc397d25fb596fe99ad.pdf?index=true
    • 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_off0000e3c7.bin
613f470825089bb76667c8f39d2beffe85db67b6f1ee898529db99067d8c28ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 5520 bytes
font_01_sfnt_off0000f69d.bin
eaa290bdeeaf8c3fe5e2a64e1e4eb0405791878d66c68ba28e3ab358efd12174
pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 10588 bytes