Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a43670798830e86…

MALICIOUS

PDF

82.5 KB Created: 2021-04-05 22:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 061d707376283f9ea74cc8d1681a7785 SHA-1: 23f9aa9268d634733e9dc4d2e00f3f8eebf742ab SHA-256: 0a43670798830e86452208559c21569aac3fddbefdbbe91360a15eec32736e83
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The embedded URL 'https://yafferge.ru/strik?utm_term=what+causes+water+to+leak+from+bottom+of+refrigerator' is the primary indicator of malicious intent. The ML classifier and ClamAV detection further support the malicious classification, suggesting the PDF is designed to deliver a phishing or malware payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/strik?utm_term=what+causes+water+to+leak+from+bottom+of+refrigerator
    • http://sajogol.iblogger.org/rokovoripemuteto.pdf
    • https://cdn.sqhk.co/tebefaravuz/qThchgd/21602329307.pdf
    • http://qrettalq.online/sizedesokuradumulasil7xsge.pdf
    • http://rijebutaj.22web.org/how_to_connect_uniden_cordless_phone_to_base.pdf
    • http://copyrightsupportforlnstagram.com/yard_machines_mtd_tiller_manualgnrbf.pdf
    • https://cdn.sqhk.co/fekurisakez/f8ieAGx/iphone_multiplayer_snake_game_online.pdf
    • https://cdn.sqhk.co/tebefaravuz/fjeiifp/gujerefojelokari.pdf
    • https://cdn.sqhk.co/zapimafe/ijheii3/jiteg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vorakufi.epizy.com/how_to_change_drive_belt_on_snapper_snowblower.pdf
    • https://uploads.strikinglycdn.com/files/392e9aab-2b8b-4b8e-9ffb-2f15f96acd0b/75319822071.pdf
    • http://muxekatuwig.epizy.com/how_many_grams_of_carbs_in_a_taco_bell_soft_taco.pdf
    • http://javasuk.epizy.com/96557714750.pdf
    • http://dosatetirudipu.epizy.com/diretriz_asma_2020.pdf
    • https://uploads.strikinglycdn.com/files/08a295c8-9a58-4e59-b288-64f011c8c892/nufivoluzutijesokilof.pdf
    • https://uploads.strikinglycdn.com/files/a2d7c8bc-aa6f-4ea2-be65-246ce73ffad5/frasi_di_chiusura_mail_inglese.pdf
    • http://luzupofodofudo.epizy.com/fourth_grade_math_worksheets_with_answer_key.pdf
    • http://dibawuleseba.rf.gd/figox.pdf
    • https://uploads.strikinglycdn.com/files/3fae418e-ab30-497d-aaeb-76400bfc00e2/72556866652.pdf
    • https://uploads.strikinglycdn.com/files/28cd6b16-bbd3-4ec8-9874-daf69db0561e/syma_x5c_battery_2000mah.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_off000103b4.bin
3220956b73756be67a3fec1aaddef8bf48cf0a386832fc7ad50e3ecf2286e720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 5604 bytes
font_01_sfnt_off000116b3.bin
56efc6266fa9d4a3cd8452603658c88b441552e7732a8a7152cf79137ad364cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B3 11288 bytes

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