Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0c8f5a86911685…

MALICIOUS

PDF

76.2 KB Created: 2021-03-05 08:14:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cb98011c8620a9e55d36dd16a05d8a67 SHA-1: 2aeb955c711cf7aeadf52d7ec42c6f73fa6831dc SHA-256: 3a0c8f5a86911685cf0af1716cd3df533c574804c9d36287751f27a26aa600a7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it functions as a link farm. The primary URL, https://kuzutuzo.ru/award?keyword=lyrics+to+this+is+amazing+grace+by+phil+wickham, is likely part of a SEO manipulation scheme or a lure to a malicious site. No scripts were extracted, but the PDF structure and numerous external links point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/award?keyword=lyrics+to+this+is+amazing+grace+by+phil+wickham PDF link annotation
    • https://cdn.sqhk.co/gozafavapawu/jdAiiDl/rogom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369935/normal_5fd164289cf24.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/dhgFgce/mezidapumopab.pdfIn PDF document text
    • https://jogotipopawufi.weebly.com/uploads/1/3/0/7/130740597/bopomawumisunav_feniliz.pdfIn PDF document text
    • https://xuvibelatubeni.weebly.com/uploads/1/3/5/3/135306186/f86a2.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/hfkr7qv/urdu_islamic_ringtones_free_download.pdfIn PDF document text
    • https://jobuvurivoko.weebly.com/uploads/1/3/2/6/132681743/2820689.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/novederidamukikusevakufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375203/normal_601347a22062f.pdfIn PDF document text
    • https://fiwuvoreguno.weebly.com/uploads/1/3/4/0/134000104/towuvutigosexut-waxiwis-saxazapukit.pdfIn PDF document text
    • https://tepojaja.weebly.com/uploads/1/3/5/9/135966759/pavutuji.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevesijuduma.atwebpages.com/gypsy_moth_caterpillar_rash.pdfIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_222c2e5f110944a9b9c4b3f5b9da4202.pdf?index=trueIn PDF document text
    • http://naxesabefadufu.atwebpages.com/what_is_a_unity_of_place_in_literature.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_d0274d8119a84a2bb7ce010176e27afa.pdf?index=trueIn PDF document text
    • http://bebovufuvuji.myartsonline.com/dell_ultrasharp_u2415_review_photo_editing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df25d04-e94b-4edf-acd6-ad41e377a2f3/4679909547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe8effe-e24f-4c92-a8dc-84a56467d965/57271961646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9fc2a1d-2870-480e-991b-2d116c85e960/fawulebu.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_off0000ec0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 5736 bytes
SHA-256: f3ae282769bedb3bb6edb64d47a9147fe976d5a02edab705520b654238f1d450
font_01_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 10524 bytes
SHA-256: d932cd3230b0bad9cf5b26db8d56ed29b915b5baf39525bf85f394de1f6d767b

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