Malicious PDF — malware analysis report

Static analysis result for SHA-256 621c5e081d8bf597…

MALICIOUS

PDF

37.2 KB Created: 2020-11-08 14:11:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 20e1741fd9eb256a149ba3dcd0325722 SHA-1: 9e40072aff4cfd06cc2952f63bcab2d33b15c93a SHA-256: 621c5e081d8bf597daa21df2b726dd1a54d0c0a2d616c28080fe8cf4f3f39a36
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are SEO-optimized PDFs hosted on various platforms. The primary malicious URL, 'https://traffking.ru/aws?keyword=laurel+taxi+service+laurel+md', is likely used to redirect users to further malicious content or phishing pages. The ML classifier strongly indicated maliciousness, supporting the presence of a link farm designed for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffking.ru/aws?keyword=laurel+taxi+service+laurel+md PDF link annotation
    • 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/2973d803-4de3-4da8-a409-92543c21362f/67207064260.pdfIn PDF document text
    • https://matodokabaj.files.wordpress.com/2020/11/risafapovuk.pdfIn PDF document text
    • https://suvarofora.files.wordpress.com/2020/11/95519257918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e51f81-275a-406a-b39b-5723d8c172c3/garebumofexoluvas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8f5242-d3e0-4443-b0c8-63a56db10527/wowujoxised.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae8b8c34-9e25-4950-bef9-07765777c05f/chemical_guys_jetseal_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/juluketuposaxevifaxidunag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b77120-ff04-45d6-8945-00325a651f9b/polujalobatup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36127575-237b-4f69-832f-c897031257bf/bozomejekazalenajalejedi.pdfIn PDF document text
    • https://serumedabu.files.wordpress.com/2020/11/beer_s_law_lab_phet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b469dc58-1b98-4cd6-b325-2ae10167ecac/66010699784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3e130fd-2a04-4ffa-891a-99525d367b5f/apk_download_for_text_now.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_off00004943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4943 4820 bytes
SHA-256: e4005f440a8612175292cc31ae1f34c5c7b7e983d2cd03ac40cb6c54b21bc493
font_01_sfnt_off000059a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59A8 9500 bytes
SHA-256: 0ee0defb4a6b9ad91e29ea27484bcab1c151dd845db4bd63b487e028e0a6cfb3
font_02_sfnt_off00007a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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