Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ee2876fae39d85…

MALICIOUS

PDF

82.5 KB Created: 2021-04-19 11:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78a9331b2caf357c76d0458a292168cc SHA-1: 9b5ad26c71feea0dd98915b41054afa47b28bcb5 SHA-256: 22ee2876fae39d8546279c905c6aebcbc74aa735217cf6e49699800e52d563b4
156 Risk Score

Malware Insights

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

The PDF file was flagged by a ML classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, with one pointing to a suspicious domain 'pelibifir.ru'. The presence of numerous links suggests an attempt to manipulate search engine results or direct users to malicious content, aligning with phishing or SEO spam tactics.

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://pelibifir.ru/strik?utm_term=male+characters+in+the+bloody+chamber
    • https://cdn-cms.f-static.net/uploads/4426942/normal_600e96e4ce30f.pdf
    • https://static.s123-cdn-static.com/uploads/4476302/normal_5fcbe21e6a4d8.pdf
    • https://static.s123-cdn-static.com/uploads/4487206/normal_5ffc31aac75ba.pdf
    • https://cdn-cms.f-static.net/uploads/4417536/normal_602edf436f87c.pdf
    • https://cdn-cms.f-static.net/uploads/4407316/normal_603edef9c9590.pdf
    • https://cdn-cms.f-static.net/uploads/4368999/normal_604025b043182.pdf
    • https://cdn-cms.f-static.net/uploads/4379046/normal_601f2bf83590c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fcd5c0ef-2679-4cbc-9599-8db030d02c90/67960808281.pdf
    • https://uploads.strikinglycdn.com/files/92623c53-a324-4fbf-bff2-c72679e8ceda/xuzanonulilugipenorizefu.pdf
    • https://uploads.strikinglycdn.com/files/1d35ad90-5d44-4535-b0d4-10acbe29fe70/sojubevivugonomuj.pdf
    • https://uploads.strikinglycdn.com/files/55431dbd-152e-4274-b44c-fc6c2167f963/62169950094.pdf
    • https://uploads.strikinglycdn.com/files/8421c2ce-51f8-4b97-92bc-5cbafb13d0d0/tuziwomeron.pdf
    • https://uploads.strikinglycdn.com/files/78011932-58ab-4439-a3a9-d37c384ff4f5/lenovo_smart_band_app_for_iphone.pdf
    • https://uploads.strikinglycdn.com/files/493432aa-08da-438c-a533-7f03b63c112a/casio_w-800h_watch_strap.pdf
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_8692ec9718a949b1b640da81035646a9.pdf?index=true
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_c696c0c7bc774dbcb292d841c36b2b5f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5ee70ea5-f9d2-48d7-99ad-6e9fb6549c77/royal_navy_diver_ranks.pdf
    • https://uploads.strikinglycdn.com/files/d0d5d6ec-8509-48c0-aec0-6891aa0be54d/74345453343.pdf
    • https://uploads.strikinglycdn.com/files/40589fc9-ffea-4208-9090-1e5ca773df8b/pasos_para_desarrollar_un_algoritmo_computacional.pdf
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_9d396da8ebbd4280a9c378c7fac5d8fd.pdf?index=true
    • 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_off00010299.bin
5c7735ea3f0a6b584187dd442b51e589516215b147ba8cb164f990e218adcbd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10299 5428 bytes
font_01_sfnt_off000114f0.bin
7cdd06ca4a75a07416bc3bda2d95202367981148d57deab184e92d875cd79355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 11472 bytes

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