Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5197ae68fe39490…

MALICIOUS

PDF

71.6 KB Created: 2020-12-19 16:21:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f807dfba9bf2b5a1b90e54d0af8a777c SHA-1: 83f92bbb07f1edc22979e0d7a742c477c02a982a SHA-256: c5197ae68fe3949021dbd6c1889667558dd037ed60911df40a561964f6e91226
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as https://trafftec.ru/strik?utm_term=nc+spanish+standards, likely serve as entry points to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=nc+spanish+standards PDF link annotation
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/muvamezuwiju_sunovopekug_lozova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fae1ed5e6b94.pdfIn PDF document text
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/880481.pdfIn PDF document text
    • https://xebivonejawaf.weebly.com/uploads/1/3/4/0/134096192/1af88f.pdfIn PDF document text
    • https://fofosaja.weebly.com/uploads/1/3/4/2/134234592/1556960.pdfIn PDF document text
    • https://pasojonili.weebly.com/uploads/1/3/4/1/134108831/b1c236.pdfIn PDF document text
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/nadigonek.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/72f3839f-5515-4dcc-860c-46e78d57c821/eu4_client_state.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5502e3-d173-49cf-9304-28a3b397c700/speak_with_alleria_at_lights_purchase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd4d590-69b4-4b69-b936-1ef1234a920e/dudexitimaxonevali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e939fe8-38ab-4b50-be4b-352aaef9c8db/17434696686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b9d4fbe-a0f6-46f5-9d5f-2543ebbda33f/46042959430.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_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 2960 bytes
SHA-256: a4eee3438a7246650f0a21218a9bc29d7bc7bf1b287bce9df301f714692068dd
font_01_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 5096 bytes
SHA-256: a36df1be04d99d4c8e448288b64ea12e5223e9269f04efd2f8a3e7af81ec6b74
font_02_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 10456 bytes
SHA-256: f013ac3b0f247775c4a992db0dcea204738df226207bf95d816ecb38a10ee259

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