Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bc817842d26bb8…

MALICIOUS

PDF

79.9 KB Created: 2021-03-27 22:38:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 01653d7bdc69bce6c0dcf2b5e9fec15a SHA-1: 4bdcab7b5fa948a8078dce721e9f81acad0471ab SHA-256: 02bc817842d26bb88594450ecced795567f30c9e75881858f8604c217338d658
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded URLs further supports this, although no scripts were directly extracted to detail specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=best+sour+cream+topping+for+cheesecake PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416131/normal_603b7bf87233b.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/45049387314.pdfIn PDF document text
    • https://diwimiwiwomenen.weebly.com/uploads/1/3/0/9/130969795/kuxepol.pdfIn PDF document text
    • https://keromarire.weebly.com/uploads/1/3/0/8/130873863/6200641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_60367248e5e39.pdfIn PDF document text
    • https://tizukusijevawus.weebly.com/uploads/1/3/4/4/134454617/318b9c802d3e41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_605d3bb48e471.pdfIn PDF document text
    • https://mamiwego.weebly.com/uploads/1/3/4/3/134315995/5589446.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cb1c90e-07cf-4522-b85d-4edd8abc33c8.filesusr.com/ugd/0c41e7_00c3c870b0e24b8d8e14744d833dfee3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de8fe913-24f9-42dc-83fa-0db4f13bc94d/vojonumuxipulamipo.pdfIn PDF document text
    • http://girofili.myartsonline.com/legedazikomad.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/zovikefokodovo.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/veg_snacks_recipes_indian_in_hindi.pdfIn PDF document text
    • https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_204d25d428c842eb84b6b2cc21948e08.pdf?index=trueIn PDF document text
    • http://ropupifalapoges.atwebpages.com/bank_exam_maths_book.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/best_flight_sim_xbox_360.pdfIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_25266560145143ec85513b276382ed85.pdf?index=trueIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/ayala_corporation_company_profile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7158c287-a299-4528-8e0b-889b2b72f4f0/lifetime_basketball_hoops_customer_service.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/strength_training_exercises_for_beginners.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_cd06e465525e4b66b95f4811ad3984ad.pdf?index=trueIn 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_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 5512 bytes
SHA-256: b505d2604233694dadf26521dad08cdf443999c4e6d2b081ca02c6975b54cb13
font_01_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 11740 bytes
SHA-256: 453c4bc44f1c5bd657656d9d2ea5a815ea902f3755e8d06ba31dd6e62fdd934a