Malicious PDF — malware analysis report

Static analysis result for SHA-256 e030eeba37989495…

MALICIOUS

PDF

82.6 KB Created: 2021-03-31 01:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 94e048da1b41595fd81aeb9971191e22 SHA-1: 2f265713df91bb25234b84477a2371184fb526af SHA-256: e030eeba37989495a80d8762fe4e67072bb01a715fab73bf4a4e6defeecf06a6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and the heuristic findings point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://soxebez.ru/strik?utm_term=1001+nights+book+summary PDF link annotation
    • https://bopamoverera.weebly.com/uploads/1/3/1/4/131408256/3693839.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_60556a508ef68.pdfIn PDF document text
    • https://gererojakomez.weebly.com/uploads/1/3/1/1/131163960/3917876.pdfIn PDF document text
    • https://dukowitemodilel.weebly.com/uploads/1/3/5/3/135316140/2528125.pdfIn PDF document text
    • http://redawifaki.22web.org/71947551658.pdfIn PDF document text
    • https://jegivobepumo.weebly.com/uploads/1/3/4/4/134444156/tavubojuwonegiv_salisu.pdfIn PDF document text
    • https://kuzapulekoxiror.weebly.com/uploads/1/3/2/6/132681507/fifujipawitanus.pdfIn PDF document text
    • https://sesanejaw.weebly.com/uploads/1/3/1/4/131407178/riwadexokodofog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_6031ef74ad1ac.pdfIn PDF document text
    • http://zopevaxawoxe.22web.org/el_si_de_las_nias_cervantes_virtual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412599/normal_5fc6f403d48bd.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/582d817d-0c1c-4e90-bab0-0d9fc3233ed5/2018_forester_review_australia.pdfIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_2ffe91fe0dbc477885600679bd8c1a75.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/986e0f78-f9c5-4db9-b825-05a22c15951c/92853642235.pdfIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_915411766d3a4e988adfac8af085d6a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0996edf-71ce-47c9-b5e0-1a96ce1a7a18/how_to_choose_a_pms_color_in_illustrator.pdfIn PDF document text
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_8c81e7a3870845bfbac0bd1bb4e93346.pdf?index=trueIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_f889f005538f46208b3eeab8f1d6470d.pdf?index=trueIn 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_off00010674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10674 5472 bytes
SHA-256: 5dcd8640a3a720d2cacbe659675ed8b3c5a172a9c241c30ed111f755acbdcae9
font_01_sfnt_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 11028 bytes
SHA-256: 952c04cec1bec04525265bec32f2b593f9fa23e2f58070388ee3b8a56b48492c