Malicious PDF — malware analysis report

Static analysis result for SHA-256 40efd10525f75fc5…

MALICIOUS

PDF

82.2 KB Created: 2021-04-19 23:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0f599f27466e4fcc55f52c458b79b6b7 SHA-1: 288b930acfaded551221d60c9180107191349277 SHA-256: 40efd10525f75fc5a8933e724b4d68373c12d78e041e40e3586ad48429ddc588
96 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'https://vilenefex.ru/strik', which is a strong indicator of a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to a malicious site, likely as part of a spearphishing campaign.

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://vilenefex.ru/strik?utm_term=what+does+nag+hammadi+mean PDF link annotation
    • http://mitutepoka.medianewsonline.com/sjogren_syndrome_journal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_5fe6add52aff0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449187/normal_5fff184635752.pdfIn PDF document text
    • http://xubajur.mygamesonline.org/traditions_buckhunter_pro_inline_muzzleloader.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369905/normal_603b1f0658e23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375699/normal_5fc9438918f5c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/99491001186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff61b6cc-3f27-48b8-a826-97d8dfedd311/88151796579.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/60017131659.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac618ff6-da1d-490a-9d48-21f8e6a01afa/david_adam_the_man_who_couldnt_stop.pdfIn PDF document text
    • http://poxemibusap.epizy.com/juwur.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/left_behind_books_author.pdfIn PDF document text
    • http://rixibedi.onlinewebshop.net/nozegapajejew.pdfIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/5984246471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f7c15c-6d27-422d-aaf2-8183c9c2861f/mujikeredixajuraveker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf999b0-d753-43b5-8057-e3d0e1d2c7ce/myron_mixon_rib_bbq_sauce.pdfIn PDF document text
    • http://faloboxodutak.epizy.com/usa_time_zone_map_12_hour_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/letter_from_santa_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/work_song_cannonball_adderley.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 5124 bytes
SHA-256: c555c340754af521a92e9717e6b332f395e2b05db2397e1b1701d7bf5e023326
font_01_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 12036 bytes
SHA-256: 46d1a5e70be42d2b0e48a77dc43b9b57d2b2811a5544e7d82cb516166b2e1ee4

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