Malicious PDF — malware analysis report

Static analysis result for SHA-256 8898d6ba87449bb9…

MALICIOUS

PDF

114.8 KB Created: 2020-11-26 04:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2bc48a2ac77163a98df21eba8d26b7b5 SHA-1: 70f25800962678c555934c796db87d8ee9539f0d SHA-256: 8898d6ba87449bb960e2e83fe7819d635e029326c4ec9217c97752d03a2733ae
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://traffset.ru/strik?utm_term=brainstorming+graphic+organizer+high+school, is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate maliciousness, with the latter identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest a phishing or SEO abuse campaign.

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://traffset.ru/strik?utm_term=brainstorming+graphic+organizer+high+school PDF link annotation
    • https://sotalopi.weebly.com/uploads/1/3/4/3/134345355/pumitupegawojixari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386605/normal_5fb40687f32c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_5fbeecb000cab.pdfIn PDF document text
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/9570453.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/db824af2-1a9e-4348-b0f9-689e5e739e0c/21414550653.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d4a7d5-270e-46d5-8a82-c0ed3f829293/veloxukirafotemip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f5634cc-fd05-4b62-a19e-8144dc95d571/zexobesedoxosuwilatobage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0379bd59-1e7a-4cc1-816f-0c156a1336af/6535374372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77b155b9-a7ed-471c-b623-987e213e60c2/library_assistant_cover_letter_no_experience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baac530a-8fbc-4c58-b8b4-d2e41bfc6704/civil_engineering_reference_manual_16th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c1cd67-386a-4de0-864f-4564f6782dfc/the_dichotomy_of_leadership_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/269dea0e-e95e-4b9d-87ae-3b688905a71e/1-99_hunter_guide_osrs_theoatrix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06f6c0b7-7669-4246-8bfc-b7b6ff61d3e4/dewalt_metal_cutting_saw_14-inch_dw872.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_off000185a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A4 5448 bytes
SHA-256: 66e4baa339824ec5e7593bb640586fff9845ef9ce6cdea91861db740bfaadb5e
font_01_sfnt_off0001980d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1980D 11164 bytes
SHA-256: a44e1f02f33b25263fa5ae0a39bfee8fcc1d219e199d5e9df79b3c823d717836

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