Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1067460636c42e9…

MALICIOUS

PDF

80.2 KB Created: 2021-03-21 08:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: f94ceca5d7d6d177d2af21dab436078b SHA-1: cd5f7662d1f3d43f7da2aa5f09844d12b8daf558 SHA-256: c1067460636c42e93c6b3a9bb0f9e57b2824684675503b834205b53d614a5f6b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and a link farm points towards T1566.001 (Spearphishing Attachment) as the likely initial access vector, and the exploitation of PDF vulnerabilities for redirection suggests T1203 (Exploitation for Client Execution).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/123?utm_term=a+christmas+carol+the+musical+2004 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500904/normal_5fcdb7b0ae9b6.pdfIn PDF document text
    • https://rokaxitifefisol.weebly.com/uploads/1/3/4/0/134040577/lekirij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528959/normal_5fd615ca9711f.pdfIn PDF document text
    • https://noxolawozin.weebly.com/uploads/1/3/1/4/131452883/3908853.pdfIn PDF document text
    • https://kifirazet.weebly.com/uploads/1/3/4/7/134715796/b74b37f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389370/normal_5fddfe9f524ed.pdfIn PDF document text
    • https://pakefexudexabe.weebly.com/uploads/1/3/0/9/130969404/6e632d5f8e.pdfIn PDF document text
    • https://lojumokixawivi.weebly.com/uploads/1/3/4/3/134370302/184474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_601a0961d0b95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413707/normal_604f5629dc016.pdfIn PDF document text
    • https://giwizakewat.weebly.com/uploads/1/3/1/8/131857916/fb860edee0cfdad.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/gh9f4ig/11772283065.pdfIn PDF document text
    • https://bugedosase.weebly.com/uploads/1/3/2/7/132712019/86c950219.pdfIn PDF document text
    • https://zevexeduj.weebly.com/uploads/1/3/0/8/130874566/semezevabo_zilavibogeren_lelaziga_sadiv.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/2xjhcie/bounce_back_loan_lloyds_forum.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/dihngja/74998722176.pdfIn PDF document text
    • https://cdn.sqhk.co/wusuzevomo/hggcEIh/best_paranormal_movies_on_netflix_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_60467ad0c1872.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/debiwelof/oh_baby_telugu_songs_free_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/5228472179.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/english_phonics_flashcards.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/kitchenaid_stand_mixer_sale_toronto.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_off0000fbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 5392 bytes
SHA-256: 7c9e2f2aa6d7703cb9a5e1ab23182d50dca6e88fb866489354cf2a09e6d1fcb8
font_01_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 10856 bytes
SHA-256: f8dcafb8742518fac5e4288e6e34208a48b7c8f6dc1db9014e04d3c478dd0a75