Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ab0e5b4b327501…

MALICIOUS

PDF

68.6 KB Created: 2020-11-11 11:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 6add68a870b1aa27b2c49c0f95452cbf SHA-1: 0f778d129108d291e3c19637e1f2ee78c7ba52b7 SHA-256: b7ab0e5b4b3275016ce9649d4c6f799a595a3cd18ba14a49e6318e1709d7fec5
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. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO abuse tactic. One embedded URL, 'https://trafficel.ru/123?keyword=religion+in+brazil+facts', is particularly suspicious and likely leads to further malicious content or phishing pages. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its direct intent.

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://trafficel.ru/123?keyword=religion+in+brazil+facts PDF link annotation
    • https://xuxewisi.weebly.com/uploads/1/3/4/2/134235501/tenosadusex_feritepor.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/6990377.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/retaguzavewub-fererakazov-rubuxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5fab14792a8ba.pdfIn PDF document text
    • https://lajawenofuki.weebly.com/uploads/1/3/4/5/134501859/pusurubexogi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_5fab11c5f0159.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/6004958.pdfIn PDF document text
    • https://zijavenokin.weebly.com/uploads/1/3/4/3/134315340/b0668d179df5b.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/9a66f9d586ed2.pdfIn PDF document text
    • https://mivopolidenez.weebly.com/uploads/1/3/4/3/134349928/jomipes-sofomoz-tolato.pdfIn PDF document text
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/0889301.pdfIn PDF document text
    • https://daxuregivav.weebly.com/uploads/1/3/4/4/134431970/4707907.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/xiluvelu.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/a37d415c-98ec-408f-a853-2be6d85f084e/2566194981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c593579a-ae21-4ffe-966a-77b97adeaeeb/voxopawutawilekufakov.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_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 5244 bytes
SHA-256: 26ecea96162173751821bee588337ac4e6babf6883288b086305b6e4037f45b6
font_01_sfnt_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 10116 bytes
SHA-256: 5341414e01b5c03aadf8be1d18d751a630dbc3664a4521180330d2d62155de41

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