Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8ff3f42b208669…

MALICIOUS

PDF

55.7 KB Created: 2020-11-08 22:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4b3944b66584757bee3e3c72f871120f SHA-1: 5d5cc0b4ed7c5e93a03aa70fca2029a071698fa1 SHA-256: 0e8ff3f42b2086694256c29318eee16576ef3606caf9ede8fd40576db51143e8
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. The primary malicious URL identified is https://trafficel.ru/123?keyword=orr+from+catch+22, which is embedded within the document body. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, likely related to SEO spam or phishing campaigns.

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://trafficel.ru/123?keyword=orr+from+catch+22 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5fa0b78a42be1.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/ad9d8f01edf262.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/53a4596c090b841.pdfIn PDF document text
    • https://nadazilagola.weebly.com/uploads/1/3/4/3/134314388/dokurudazedudevitu.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/3fbfa022.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/584bc64c-cb28-481a-969b-f302285f3d57/fomarubabubijomor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60308ddf-429e-4988-b995-25397debbea0/63447516432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c43427b-0c8a-4545-b1b7-11d36fb122e5/jedapiriretorabiperot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488d5b51-029d-43e2-81df-711823bbc5de/56595767492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5482388-32f2-412c-adfa-ad1cdf050785/mesuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b16a2a-2caf-447e-bf26-41e91b695828/jimmy_kimmel_boycott.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ad618a5-c4b0-4f3f-821d-c2b3dddd85d1/exerccios_pronomes_6o_ano_com_gabarito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f49484-5b0c-4ade-b0cc-6dafca872a09/ligedavasumexopura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05a25358-5f04-47df-94f4-48407d5b5de2/53353145484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51458831-e969-43df-9c93-070a36edf43e/jabariya_jodi_full_movie_free_openload.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8385 5068 bytes
SHA-256: f776e6262dcd382c9a8dd42f96f5efac097b03cb63b4fb7a1d209d3742456701
font_01_sfnt_off0000949b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x949B 10392 bytes
SHA-256: 6c6207f2c7a23766af16387a114c2cfa2ae6fdc8e7eaa34b3bf96b0ece1f7fa5
font_02_sfnt_off0000b875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB875 17196 bytes
SHA-256: 2107862318f1891f85872a2f4d168dfddfbda50a686aeae2cef129d0c0588b85

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