Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8181ee5d30a4d1…

MALICIOUS

PDF

69.0 KB Created: 2020-11-20 00:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 644e43e91a3e397e7868165369f7478e SHA-1: 1ebdfc8f737b5e949adccf1489b886b0c3c0a0e0 SHA-256: 2b8181ee5d30a4d10a6b27d15a42924108ead2b9b1d2e401045d69b446beb376
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or phishing attempt. One of the extracted URLs, 'https://trafftec.ru/strik?utm_term=rust+sewer+branch+puzzle', is particularly suspicious and likely leads to a malicious site.

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://trafftec.ru/strik?utm_term=rust+sewer+branch+puzzle PDF link annotation
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/208830b.pdfIn PDF document text
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/vefevudosowaxasaguk.pdfIn PDF document text
    • https://wezukanedipewor.weebly.com/uploads/1/3/4/6/134602888/zifukenam.pdfIn PDF document text
    • https://kileligujet.weebly.com/uploads/1/3/4/4/134457719/lemubowal.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/8404899.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5f9a511f3e35d.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/cd9662c7-8988-44f5-9ad9-e753f62296b3/95166206790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e9cdda-9c2a-4215-8358-9cb7ada4914e/47100233003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1d3954a-fdba-48bf-ad5d-7692b75e838d/53364825726.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bdb1566-3d81-48d3-97ac-3636d62fbe29/zadofapadelig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46edaa2a-8a88-4dc4-8c7c-f1683ecff9de/28981639067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96400a0-2a67-4575-8801-1ac1ae2c3c57/46246257809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4ac03a-40eb-49f4-af00-7c123eefffb0/1359103282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e36cce42-ccc2-4c26-94df-ab59f59551e5/81658704192.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_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 5312 bytes
SHA-256: a66f38086900ab88d057ebcd0a84f1fd22feb391e8d62cee1271cb92bf15e068
font_01_sfnt_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 10340 bytes
SHA-256: 63da24ddf89c0a1f655fd080d83994cc91588a13eeffb8480cab0c836802be71

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