Malicious PDF — malware analysis report

Static analysis result for SHA-256 356ebea27655697a…

MALICIOUS

PDF

80.5 KB Created: 2021-06-05 17:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ea97c538fbadd04bc9ed469891f0fb9 SHA-1: d03cd937738e9e95bc235f3e018a0dec85b8dce9 SHA-256: 356ebea27655697a14e64f8283f518b9b4d5bcb1c5ebce111425e45480eddbaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, likely intended to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/pbw?utm_term=behringer+xenyx+1204+usb+software
    • https://cdn-cms.f-static.net/uploads/4407314/normal_6044d0d913075.pdf
    • https://static.s123-cdn-static.com/uploads/4443809/normal_5fe277514f4ca.pdf
    • https://cdn-cms.f-static.net/uploads/4472776/normal_5fe7a4e896bb3.pdf
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/6a96f30e.pdf
    • https://sawajarenemobo.weebly.com/uploads/1/3/4/4/134494328/2260c29ecc4c1b.pdf
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5fccd35679479.pdf
    • https://cdn-cms.f-static.net/uploads/4366402/normal_6062af9818d7d.pdf
    • https://nifavoweju.weebly.com/uploads/1/3/0/7/130739528/3731056.pdf
    • https://static.s123-cdn-static-d.com/uploads/4392441/normal_60b6f3607c882.pdf
    • https://cdn-cms.f-static.net/uploads/4495265/normal_6040b2fc19eac.pdf
    • https://mawebugejememed.weebly.com/uploads/1/3/4/5/134599942/vevelenokaza.pdf
    • https://static.s123-cdn-static.com/uploads/4420917/normal_60081e613d48a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cb15e3c5-2e52-4d88-ba47-eae86f7ff0bf/ninoz.pdf
    • https://uploads.strikinglycdn.com/files/b4dd5c1e-591f-478b-aef9-390d752106c1/diperinet.pdf
    • https://uploads.strikinglycdn.com/files/c4326edc-2c06-4f1d-ae9f-f2c08333612e/47472552607.pdf
    • http://gemometis.pbworks.com/f/gizasetuwotiwisarufokik.pdf
    • https://uploads.strikinglycdn.com/files/13fc49de-3993-4784-a5c9-689b87f9793f/98774067703.pdf
    • https://uploads.strikinglycdn.com/files/a83fbab0-dc9d-4b8c-98c6-d32570ec3277/xifokebofozovuriwize.pdf
    • http://fujiserefi.pbworks.com/f/79287724357.pdf
    • http://pebolokunaz.pbworks.com/f/what_does_hamlet_ask_his_mother_to_do_in_act_3_scene_4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc6c.bin
4120495a7e8e3da3a5452bf592f3799bd0826ca16ec555c64d53dd03a080afff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 5864 bytes
font_01_sfnt_off00011089.bin
74e90873e51e8ff4bbb76e096b5616e0bb2134f8d7783926db60efdd622245ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11089 10752 bytes

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