Malicious PDF — malware analysis report

Static analysis result for SHA-256 565d46d1e45c9fa8…

MALICIOUS

PDF

66.8 KB Created: 2020-11-26 04:25:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b7400711e273f4d212a89ba8d4426458 SHA-1: 3fb1ca2ad3ea358943844f53656cd9c10e1a95e6 SHA-256: 565d46d1e45c9fa811c667e0dea9a9c994ee10424d9d863d507319c44695702a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to domains commonly associated with SEO link farms, suggesting a tactic to artificially boost search rankings or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery via the embedded URLs. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

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/123?utm_term=crack+the+case+game+questions+and+answers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383687/normal_5fa370375ef53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5fa6fe72325d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f936c00abd9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fa00661da6b6.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/todufomesobunemuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_5fb7a0ba41097.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/a1f4d4f5-549d-42ad-8b7c-43fbbda1446f/oae_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/undertale_clicker_sans.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/mobudusuwupemon.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/gikikigufiledeligepegeji.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/why_animals_should_not_be_kept_in_cages_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b117a1f8-7e6f-414b-bda8-7251632085b7/notoledogimutivunonalej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0919e1ea-3c98-4d7e-b0ad-a18770372df4/farutir.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_off0000c591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC591 5724 bytes
SHA-256: 02a8e92d84930d0b02e8654fc1ec33c82b4b60b318940c480ad70851c0a65054
font_01_sfnt_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 11276 bytes
SHA-256: b613c6cf5af9c948d2ebde6835e5b86db91dae7248f2ae2da1d01c5dac9e2fda

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