Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d633d69728d6ea0…

MALICIOUS

PDF

73.1 KB Created: 2020-11-23 19:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3080dc310a4f440ed3f3caebe80cc5e6 SHA-1: 934d38718eff62b091b798d5d4546883527fd015 SHA-256: 4d633d69728d6ea03c5e0aa53f54812eb83290a9c69cfe8ce3fd00ecbaf9cee8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=lego+dimensions+help+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390681/normal_5f915679342c0.pdfIn PDF document text
    • https://sulabejo.weebly.com/uploads/1/3/4/6/134689147/jolurolivavoganen.pdfIn PDF document text
    • https://mitigovoponezix.weebly.com/uploads/1/3/4/3/134375948/ritexegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_5fa4b1059239e.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/24b31966-a100-43f0-82b8-a216cee37420/44916052791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6906730b-d00c-4298-8500-c43940fe57e1/52285247128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c7b9cb-a527-4d80-b822-da1cb6e0925b/82396709400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1b8ba0-e188-4072-9288-2d9e7f314bdf/process_and_procedure_manual_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b835d2-8e5a-4cc3-848d-c74ee1a03bf3/partituras_corales_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f89617-d2f1-4c5b-aaab-a41c16da85ee/peak_property_insurance_company.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0da570f6-5aaa-40de-a3b9-d10dac463ab1/sarasota_to_tampa_taxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8204af26-98b1-4f7a-85f0-22923452bc59/50173897914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8283c63-48b2-48c8-97af-ac357c9f4532/17550941677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f319d2a2-4922-4bc4-8d7b-40cac5c5aa5e/19087872548.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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 5008 bytes
SHA-256: 94f8313047355144c641704505280612e9c1e31352e2d89bb722e555f836c975
font_01_sfnt_off0000f2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EE 10676 bytes
SHA-256: 9d13701e8ba564bb47a69ec70f30beeacac16c713c60d1198eaa16849e1e1e55

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