Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe321797a924ada9…

MALICIOUS

PDF

73.0 KB Created: 2021-05-25 07:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6dd2cbddeefbc9dc37b8f90d49d0ea0c SHA-1: 809f27d12255cfb4cd78264ab4b42e2da4fa3c17 SHA-256: fe321797a924ada91c47866586e807b616219bb5454e6e0097aeb9b59e0decc2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a common tactic for link farms used in phishing or to distribute malware. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://botokaw.ru/strik?utm_term=how+to+reduce+poverty+in+urban+areas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fd038c295909.pdfIn PDF document text
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/715e49fb0.pdfIn PDF document text
    • https://mexejafulid.weebly.com/uploads/1/3/4/8/134880369/3e2b8d4d8.pdfIn PDF document text
    • https://fufarolobol.weebly.com/uploads/1/3/4/5/134597676/makabegijogosano.pdfIn PDF document text
    • https://zowadadevifu.weebly.com/uploads/1/3/4/5/134597758/ramugodupe.pdfIn PDF document text
    • https://govewusig.weebly.com/uploads/1/3/0/9/130969429/9693503.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_60579f75514b6.pdfIn PDF document text
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/b9765b19622d2d.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/vevojoligog.pdfIn PDF document text
    • https://lexedixejorew.weebly.com/uploads/1/3/1/4/131438453/sibomupabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421781/normal_60278a3c0d987.pdfIn PDF document text
    • https://xunilizavokuniz.weebly.com/uploads/1/3/6/0/136050149/nazevibaxawo.pdfIn PDF document text
    • https://jikumudepopojet.weebly.com/uploads/1/3/1/4/131453433/bb91ef5d7db8.pdfIn PDF document text
    • https://torusakewojowep.weebly.com/uploads/1/3/0/8/130814967/rebidebaf_revigobujaxuk_kopowowas_dazete.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/gekixadonuru/html5_text_editor_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/930205e5-2e28-4460-8158-f47ac689837f/how_to_export_garageband_files_as_wav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18c2b8f-e04f-44e1-a1e8-7f4a08058e2b/zibofijika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae3f3a5-4993-469d-8712-dd4a8d18e92b/pubasewakusale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/881501c7-487e-4d4f-9c44-59af3ee82e8f/91109578853.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/94082032932.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_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 5392 bytes
SHA-256: e7b7e721445598b1ec0a1efa05b2a906ad9afb4cabbc4e703b01f7f8d62ddef7
font_01_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 10504 bytes
SHA-256: 3f1d9e31ec3dded67a2666917df4ea051c164b8fee7d1feee97b43cf2c609b01

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