Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a60cf2a93f3b029…

MALICIOUS

PDF

76.7 KB Created: 2021-04-27 02:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1a9bc0bf2e8e145839ff8d704a1153a6 SHA-1: c567016f573e7cccedbc8fc5b46c65a5f5f999c4 SHA-256: 0a60cf2a93f3b0292891c36dd21ff1fd4fb81c96bbfe6fcd026cc130a1394f9f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine rankings or drive traffic to various sites. One of the primary external URIs observed is 'https://zajinet.ru/strik?utm_term=brother+dcp-7065dn+drum+replacement'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=brother+dcp-7065dn+drum+replacement PDF link annotation
    • https://xafituku.weebly.com/uploads/1/3/4/8/134863640/sogilefizu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388062/normal_600056497f4de.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/789876.pdfIn PDF document text
    • https://dutofubexel.weebly.com/uploads/1/3/4/6/134631161/c6de8a08b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393364/normal_601d6be03c94d.pdfIn PDF document text
    • https://rufilepevaga.weebly.com/uploads/1/3/4/4/134444742/3318368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474470/normal_6059d74649558.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380384/normal_5fdf3d044e6ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_604178031219f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485436/normal_603a9e42cecae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_6018b11eab19b.pdfIn PDF document text
    • https://linajijokib.weebly.com/uploads/1/3/4/0/134000065/pivejozizerarodaba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jasadavebaga/macsteel_roofing_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/zigiz.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/96632237959.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/navy_civilian_pay_scale_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd3c6b9-b128-4554-ba3e-3daf740eb3da/guzisumulupobitagixotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e016b92-57f3-4d16-a24c-9bf77bb7aab7/what_battery_does_my_apple_tv_remote_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8124a1c6-25f9-45f0-8d04-7520fee102bf/how_many_books_are_there_in_trials_of_apollo.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/pugekojutexipeburaj.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/2005_dodge_ram_1500_quad_cab_5.7_hemi_specs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 5548 bytes
SHA-256: f58e929794cf17326925e16cfaca3e8f800d126af8245c1746f4751b805c87d4
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 11180 bytes
SHA-256: 09e1b27e4fae592bfe0377544ed3683a3fea7ba8d0fde8e23ecdfb71b650402e
font_02_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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