Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b81bc8e6490b339…

MALICIOUS

PDF

76.0 KB Created: 2021-03-29 14:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cfecd5eac65fe24d4d4d3d565621facf SHA-1: c7099c365a9bee4100a6392213be2ac0fb106231 SHA-256: 4b81bc8e6490b339e393400ae14a42c5a24c5ca804c03db3bd413f5d93b3f28d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, with one pointing to 'bologen.ru', suggesting a potential phishing or SEO spam campaign. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links are indicative of techniques used to distribute malware or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/wix?keyword=cuisinart+coffee+maker+dcc+500+manual PDF link annotation
    • http://lofitner.buzz/wendys_nutrition_information_saladsymqrj.pdfIn PDF document text
    • http://summ-ita.space/9828985017496zdh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_60339d23391e3.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/hihbViV/9485103066.pdfIn PDF document text
    • https://cdn.sqhk.co/kagurase/hhgpBge/15808363941.pdfIn PDF document text
    • http://help-ruleviolation.com/16428703071ji5pj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_5fd6176f9c6d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lazolu/the_office_open_xml_file_free.pdfIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_e5a85690b5a0481ab45651ee4e05de52.pdf?index=trueIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_97989756e51f478c8126d9d77a1987a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/60216357623.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/manan.pdfIn PDF document text
    • https://8994dc82-3839-475c-8de5-8afaa5c13229.filesusr.com/ugd/798b5e_eb43c6fce0e24db0972c94978f7c9fbb.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_a93af22341564ed785d754a256920d7e.pdf?index=trueIn PDF document text
    • https://b81e1767-bb0d-4562-9f98-cfef66859bb1.filesusr.com/ugd/b48b60_26242ea3a3294b49b136771a90f22920.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/25550421611.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_0008ebb4310842a0a069fda65878373a.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_off0000ea95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA95 5404 bytes
SHA-256: 411a0abf0d3b5210d61b5e8ef75422ca0befece2738be77f8273665f8da2f484
font_01_sfnt_off0000fce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 10772 bytes
SHA-256: 38454aee761b0fa28c5dc07ffc8c95526f1f9f1734ff6d28661cde815de2429f

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