Malicious PDF — malware analysis report

Static analysis result for SHA-256 52df3d67535aa0ce…

MALICIOUS

PDF

80.8 KB Created: 2020-11-06 18:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4da37c808b59d5a8cc5bbf9161545f2e SHA-1: 9070981cbbd6818c64cda1d3f12e86d7444dd7dd SHA-256: 52df3d67535aa0ce501eead2a79b9379605da5ef2f984ba255212a6311b50843
96 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 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 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://trafftec.ru/123?keyword=margaret+persona+4+guide PDF link annotation
    • https://birebojutadavom.weebly.com/uploads/1/3/4/3/134342015/b5081070.pdfIn PDF document text
    • https://valakafugajebe.weebly.com/uploads/1/3/4/3/134330742/90b63.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/wupiwupiwot/wileyplus_problem_4-3a.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/epi_prefix_medical_terminology_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/072e564b-f04e-4cee-9fb7-dff47df4617a/lomopewomogagiwufivuxab.pdfIn PDF document text
    • https://veralaf.files.wordpress.com/2020/11/nuzejilikubudomafed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cbf77e9-c253-41b9-a323-0f46856496aa/finorobasadepofopo.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/kunagapejuwulodoletepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2478d712-47f6-4cc9-a2ee-fedd66881070/xevasetitufafogipukoj.pdfIn PDF document text
    • https://degareke.files.wordpress.com/2020/11/tatokuw.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/nitofunoxuvobobudutufik.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/rakidabefe.pdfIn PDF document text
    • https://zegusotatat.files.wordpress.com/2020/11/environmental_determinism_possibilism_and_probabilism.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC662 5532 bytes
SHA-256: 0209f0edfd03e5c2e3187bf701264b245e54107fc37f37521919ad95720e81f0
font_01_sfnt_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 5188 bytes
SHA-256: f944d310aca624fad08b33738ad80e21a945f91afb4d4428aa9284796daec41e
font_02_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 16804 bytes
SHA-256: 987dd60e76215271aedd69c2ff2335058b8e8cdab5d135c687c9d24d0a8bdadf
font_03_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 16284 bytes
SHA-256: 7a8711bd274ddd8b5f3cc853f00ce972921dea23f5638c58b0b6eb1a8d9f0ac6

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