Malicious PDF — malware analysis report

Static analysis result for SHA-256 852f6f9d001fcd3f…

MALICIOUS

PDF

117.9 KB Created: 2020-12-05 07:17:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: db4692b0abf0924bd274e33dbe58c80b SHA-1: 1ee539ecd160733b905da2eb60af0a0783112abf SHA-256: 852f6f9d001fcd3fd3f7a559d858256b25184e65184364dee82d5ccfc79af2c5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'trafffi.ru', a domain often associated with malicious redirects. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=caddo+parish+school+board+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f8be941527dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444353/normal_5fa6c85b2a0bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f9063a828eac.pdfIn PDF document text
    • https://rulomegujenuguv.weebly.com/uploads/1/3/4/3/134329868/4671013.pdfIn PDF document text
    • https://nifanepuram.weebly.com/uploads/1/3/4/7/134700908/japigejenozoxetok.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/6412758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5f8db718dd1c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b4c51d66-af74-488e-93be-1f4087193151/alexx_banks_update_june_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dab0e082-df43-42f9-92dd-8ebf92dee910/difadilobegan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81335c64-01ed-4af9-adf4-3c731a2bee63/star_wars_jedi_fallen_order_lightsaber_colors_unlock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c52d7ed-cabf-4ac5-944b-0980f409414b/tufubivozoxivipawufike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14fe64d-35aa-4920-8bed-56e86a6832ca/31488567718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6a79b92-844d-4714-a878-758213863306/90254723176.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_off00018512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18512 5280 bytes
SHA-256: ffb78bd493273a7057ce504807ce136865610f6fa212a5f9428b170cb41166d3
font_01_sfnt_off000196c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196C6 10980 bytes
SHA-256: b0ceb28e09627bfc100ec674476b113644e78d36a1b922580c08d2cfc261050c
font_02_sfnt_off0001bc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC0B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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