Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48ca32ef436c17f…

MALICIOUS

PDF

65.9 KB Created: 2020-12-21 16:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 61a6729a76488de581eecd6927728880 SHA-1: 7a7e28b060b2cf3c11a972eb7ca1624800546665 SHA-256: f48ca32ef436c17f522bb4f88509fd353c940379196ca7c1f61d1bd6587b8ca8
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The primary malicious URL, 'https://trafftec.ru/strik?utm_term=brimstone+brewery+menu', is presented as a menu, likely a lure for phishing or malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafftec.ru/strik?utm_term=brimstone+brewery+menu PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475565/normal_5fa4b157b4f78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494451/normal_5fd876afb4af7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443617/normal_5fccb4b58762f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454973/normal_5fcb4806cfad6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5fd61e5827503.pdfIn PDF document text
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/wiwaboza_nezizujine_tugewokakobex_mewedezoxudero.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/63cc5153-0079-4ae8-a2b5-cc2fd078929f/39591407532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34755247-0d07-4fe6-ba6e-b97fdfd0afcd/belapewuvotavikut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eda79ba-ddbf-4dad-836a-b8841efa5869/wenuvodasufiguj.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/dark_web_app_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b816b301-1ff3-4391-ba94-4bc37837cec1/best_kratom_for_pain_reddit_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af5b717-f53b-437d-8be0-74331355e595/baxuwamaretotemikojenuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd25db32-6d6a-401c-a8ed-f0d1c141ec48/can_dogs_eat_maple_syrup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b19c24-621e-472b-87bc-fef985438d7c/anti_lock_braking_systems_allow_drivers_to_aaa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEA 2968 bytes
SHA-256: 771033003054101e9e87eceebec65dd17fac76109d4f476580acb9549e794e17
font_01_sfnt_off0000c690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC690 4972 bytes
SHA-256: 5c9decfda19fa0c42ccdb131a8ddf631469bba92db8acdcdc0c85bec76ec4461
font_02_sfnt_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 10180 bytes
SHA-256: 6579acc8205e9d54602780184a2efad81450e3841db60f04bc9698725c9bae54

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