Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b66c7af30b8ff72…

MALICIOUS

PDF

73.1 KB Created: 2021-06-01 08:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 850acd4b11935121747a16bb49529b27 SHA-1: 2ed7d464a4275fd71c70f9d4d82ff9d8d8d0d071 SHA-256: 2b66c7af30b8ff724c89838591fb88c5e85d4aac588d33acb9b1e82b877d2c64
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to manipulate search engine results. The primary URL, 'https://archism.ru/pbw?utm_term=ielts+writing+task+1+sample+pdf+download', suggests a lure related to IELTS exam preparation. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent, likely to drive traffic to malicious or SEO-abused sites.

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://archism.ru/pbw?utm_term=ielts+writing+task+1+sample+pdf+download
    • https://cdn-cms.f-static.net/uploads/4492575/normal_605cb5adb34ee.pdf
    • https://static.s123-cdn-static.com/uploads/4403673/normal_5fde155aae0fc.pdf
    • https://revarepafe.weebly.com/uploads/1/3/3/9/133997647/644cdd5709addb.pdf
    • https://tafevivif.weebly.com/uploads/1/3/2/6/132682704/2827df.pdf
    • https://cdn-cms.f-static.net/uploads/4409123/normal_600d7ab210da2.pdf
    • https://static.s123-cdn-static.com/uploads/4393632/normal_6006d47074aad.pdf
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6023cd89cf4b7.pdf
    • https://cdn-cms.f-static.net/uploads/4481993/normal_60531edee7609.pdf
    • https://nunubawuguxage.weebly.com/uploads/1/3/7/5/137504951/3521874.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e651dc87-f651-4595-877a-07546b582061/12052981025.pdf
    • http://bilabegape.pbworks.com/f/bcbs_of_michigan_prior_authorization_form.pdf
    • https://uploads.strikinglycdn.com/files/b845b443-4641-43c2-b739-2e452a43fa06/kurelaxoxufomikadesugubi.pdf
    • https://uploads.strikinglycdn.com/files/9711caa4-a091-4d5f-9eb9-4c85256de2f5/sexadijokejigawudilirosi.pdf
    • https://uploads.strikinglycdn.com/files/e49cb8e0-2dd8-4aee-91b5-4ca0c502dff2/48733051580.pdf
    • https://uploads.strikinglycdn.com/files/892f8bfd-d2b6-4d72-a541-18db71fab9ac/99125696185.pdf
    • http://xuresasadox.pbworks.com/f/19329416118.pdf
    • https://uploads.strikinglycdn.com/files/140c075a-2b63-4691-8fdd-1cf9098b6487/jimifobafunubixigewet.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_off0000dfe0.bin
19b4c0fdbcf03016eedfbf608144115cdde5fd3f3dfb1f633eecd6263134e666		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 5508 bytes
font_01_sfnt_off0000f2a0.bin
7ea68ea427f716e764575997e6b76d4fcb8b0c418ebfbffec074a499830eb653		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A0 10672 bytes

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