Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c293b9b769f7ad…

MALICIOUS

PDF

81.2 KB Created: 2021-03-15 21:20:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03b355b35b61eef5457e5e1b31e8a837 SHA-1: c5b368a8fc4151e790f0e30f3a2e3e5aaef2734d SHA-256: 35c293b9b769f7ad7f70541bded5975dde3af20e29958b1b5ab97950b35453dd
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits multiple indicators of malicious intent, including a high ML classification score and ClamAV detection as a phishing trojan. It contains a link farm with numerous external URLs, suggesting an attempt to redirect users to malicious sites. The document also includes a lure to execute commands via the clipboard, likely to download and run a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • 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 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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/123?utm_term=binkw32.+dll++for+gta+4 PDF link annotation
    • https://cdn.sqhk.co/gawukale/ELWnjc5/pejorizumezopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_604cd835cb931.pdfIn PDF document text
    • https://gumosoxegobekij.weebly.com/uploads/1/3/3/9/133999275/jobusonudevemu.pdfIn PDF document text
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/wodabedodag-jutazopemul.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/fb8Brhh/mulerokejososufomisowuti.pdfIn PDF document text
    • https://cdn.sqhk.co/patizuruf/dYQjiae/samsung_members_app_review.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/hVQnehf/bifuvawowujojirebe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404296/normal_602510dcdf461.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470830/normal_602dd197cbada.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/8ibSnhi/pobikamolujemavaj.pdfIn PDF document text
    • https://cdn.sqhk.co/pizililiv/FlXGmgc/messenger_rna_vaccine_covid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_600b2a5ab663e.pdfIn PDF document text
    • https://sipesavuw.weebly.com/uploads/1/3/4/6/134697333/jizuwun-jixewumul-tinozeze.pdfIn PDF document text
    • https://cdn.sqhk.co/pevukoza/hdyhfUz/71127204625.pdfIn PDF document text
    • https://tamaxanafe.weebly.com/uploads/1/3/1/8/131856242/giwutepuk.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/khciihe/new_bollywood_movies_1080p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_601c8d298a33e.pdfIn PDF document text
    • https://cdn.sqhk.co/konarolikomu/6cv282e/best_programer_for_6._7_cummins.pdfIn PDF document text
    • https://zinurutiman.weebly.com/uploads/1/3/5/2/135295757/jemapedarakod-kodubavopavaxez-rizis-begep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d477232-73e3-4f85-a283-aabf491483ed/pomun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dae7f21-7c87-43af-8a9d-ce019a53c4ac/sevuzovumiwura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76108f2d-bc48-4cd0-8885-b1caba28d8bc/what_is_a_verb_video_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2525aa5d-be4f-421c-b9a2-939d7b7d8da2/metidiledulixomusivozeve.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_off0000fe71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE71 5520 bytes
SHA-256: 3e72a4cd8b2f15dcf73bc7d0b754d011a5114d66dfb63e2e36135997446fdcd8
font_01_sfnt_off0001117f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117F 11156 bytes
SHA-256: b1ee5638c6b935eb91d795ba53cf219de3a6825bc7db17af3f8fd30ce3c42cf6