Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8302f96f135a0f…

MALICIOUS

PDF

74.4 KB Created: 2020-11-17 08:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ad0926311112781059af910302f2ea8c SHA-1: a1e94521e77f95f3bd85bb3d946349d6034be9a0 SHA-256: ef8302f96f135a0fb92a3aee1bf053cb76ac1674ed9e56dda18ae23091ff381e
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, specifically for containing a link to known malicious redirector infrastructure and acting as a link farm. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs suggest an attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/strik?utm_term=pokemon+emerald+rom+1.0+us In PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/natozasajerizow-kidatub-fisemanumutid-rajebodelovisaj.pdfIn PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/denabagozatez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391000/normal_5f94820a08e1e.pdfIn PDF document text
    • https://norigawe.weebly.com/uploads/1/3/3/9/133988483/963104.pdfIn PDF document text
    • https://sixifemawo.weebly.com/uploads/1/3/4/4/134470876/titamidafuzosilumuva.pdfIn PDF document text
    • https://vigasobokaj.weebly.com/uploads/1/3/4/6/134619364/lodud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_5fae79877db8c.pdfIn PDF document text
    • https://jokilexagazoxo.weebly.com/uploads/1/3/4/6/134602179/dosudidazile.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/83e05747-dc2d-49cd-94fc-fed61bde3dbb/kanudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0cf9706-6f88-4eef-8385-cc1079e4748f/transformation_of_functions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6550db0a-9554-4919-8eb9-fad9827970b0/59768669231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f538d1-b094-4394-8978-b89ebc545396/witcher_3_script_compilation_errors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81acbe7c-83bc-4234-b5cd-e6b430fda7b3/68918082266.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_off0000c1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EB 3120 bytes
SHA-256: 750d1396ea0bf5fbbfb1efa7800930e25a2e400cebbc542b316d66b1e2c172b3
font_01_sfnt_off0000cd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD20 5264 bytes
SHA-256: 76ba78f48c8732a8978fbdd4f16a38903896cad8c5df5abd3cc6715382cac73e
font_02_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 12844 bytes
SHA-256: 3b099859be2b013f43347d93d5daf3c07886af2674ff7619d38ee529ca2d64fa
font_03_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848