Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff99003cc1f3fd22…

MALICIOUS

PDF

79.4 KB Created: 2021-03-26 17:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 929b93df1fe15e8831a0c6da86a33e57 SHA-1: a38369cb79f65d700a26b89678ae00a8246b8b8e SHA-256: ff99003cc1f3fd22a34cd7b6d5f2d4fd22783669975d8be51c074237be8b65f4
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The document body, though heavily obfuscated, contains keywords related to sheet music, indicating a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/award?keyword=beautiful+in+white+piano+sheet+music+free+pdf PDF link annotation
    • https://vusobodez.weebly.com/uploads/1/3/4/3/134320146/punaliliguna-bodopedejegose-pefivoviji-funowonone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_602ec8dd20cc6.pdfIn PDF document text
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/wizarar.pdfIn PDF document text
    • http://wunowixumofe.22web.org/cute_itinerary_planner_template.pdfIn PDF document text
    • https://sedovabopidixo.weebly.com/uploads/1/3/0/8/130813108/7620733.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_603253af8782f.pdfIn PDF document text
    • http://tukofiw.22web.org/19503134450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410004/normal_6045e4c86e0f7.pdfIn PDF document text
    • http://xarolizanep.22web.org/chaldean_numerology_calculator_software.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/bifiniraxipamew_fipok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5ff33e5e4e776.pdfIn PDF document text
    • https://tozikogok.weebly.com/uploads/1/3/5/3/135330875/tufozofosapowapedeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_600d882856e9a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudolisimak.epizy.com/69751460435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88122a99-4207-441b-a134-d6db9715d7be/52965795383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03239bb6-96cc-4984-8c74-28deacdcb141/22927887774.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/24910348883.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59bf193e-5e49-4304-b2ca-e1079796a8ea/mivalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/decca9fa-7884-40ea-9da3-4db5d6fdaa38/putirobof.pdfIn PDF document text
    • http://denijutogowe.rf.gd/chuyn_i_file_sang_hnh_nh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51deee46-ccf0-4b29-8d9a-822212a27979/32323075441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b23f10b-a9ec-483c-b774-446abcda3033/67419408509.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/dobutamine_davis_drug_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/pencil_sketch_drawing_pics.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_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 5536 bytes
SHA-256: 57f9f97e6ddf7410760f7d15464ec8300c474238a86e3733654787161f7a3d1f
font_01_sfnt_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 10944 bytes
SHA-256: c801c3992896120a29abe234300675de76c1551741492c489ee235bcab32d99e