Malicious PDF — malware analysis report

Static analysis result for SHA-256 c804dc3427242fef…

MALICIOUS

PDF

78.7 KB Created: 2021-05-16 09:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d97b05380366a2717aff6b670b0322a1 SHA-1: 617421b0a2595e9d52931a4ed303fc25cdc99d58 SHA-256: c804dc3427242fef201db985b105f8f92683d51ed859e8d7ae4bb90d87988cb2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://maypoin.ru/strik?utm_term=how+to+install+a+dishwasher+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445341/normal_601fb1077a972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_605bb5ac949ba.pdfIn PDF document text
    • https://wijuluberaselak.weebly.com/uploads/1/3/4/0/134016921/fobewilomevog-fubibutir-kukejogixa-tomuluz.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/5529839.pdfIn PDF document text
    • http://nukels.xyz/rakuxolagejatilufinunoqel9v.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/hdfc_life_sanchay_plan.pdfIn PDF document text
    • https://jejaxome.weebly.com/uploads/1/3/4/4/134443668/dironuve.pdfIn PDF document text
    • http://vomamafawib.scienceontheweb.net/angles_formed_by_parallel_lines_and_transversals_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403687/normal_600ef0f374885.pdfIn PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/nubami.pdfIn PDF document text
    • http://faceit.su/sewatipejemezaserosejufs48qu.pdfIn PDF document text
    • https://kifeketefisub.weebly.com/uploads/1/3/5/3/135347095/55a5627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_60505e93268cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485454/normal_603caa33ae43a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_602f47f5b433b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_606982102f8b2.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/26692494292.pdfIn PDF document text
    • http://kumajamefe.getenjoyment.net/game_theory_john_nash.pdfIn PDF document text
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/fukenedajoriji-lanovaf.pdfIn PDF document text
    • https://fuwowomazusora.weebly.com/uploads/1/3/4/0/134000162/5936841.pdfIn PDF document text
    • https://zodazapel.weebly.com/uploads/1/3/4/5/134511258/puxamasipasuzawomegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_6015c4d4a54a2.pdfIn PDF document text
    • http://feelslike35.com/kakodegisufor3usmb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402503/normal_5fe95cba1e2ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378165/normal_600d0c33d84c7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijipola.onlinewebshop.net/jarobemo.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_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 5032 bytes
SHA-256: c7131e64aa97b04dda9cdfd07d995a749339ca9cd73ac6d005ae4215d7eb67f7
font_01_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 10224 bytes
SHA-256: a93edb7656abd8676d3c9df78b70c13251c3cc7e2b811ff0392ff2284f5484e9