Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f38eb6ca291f04…

MALICIOUS

PDF

81.7 KB Created: 2021-03-13 22:59:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d343076d6ccdfa62b49b300ed89dd673 SHA-1: 7abc6bbc23538472d8f099ac77e7ed156c20064e SHA-256: e5f38eb6ca291f04a97111778c7616a8b955f0527ed95c5568849476f911b97e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://xajibur.ru/strik?utm_term=unity+editor+download+size', is presented in a context suggesting a lure for downloading the Unity editor. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=unity+editor+download+size
    • https://static.s123-cdn-static.com/uploads/4392451/normal_5fe07487c91a8.pdf
    • https://cdn-cms.f-static.net/uploads/4383795/normal_6027a0dd0805a.pdf
    • http://bejuzoz.iblogger.org/harmonize_follow_me_song.pdf
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5fcefdeabf060.pdf
    • http://dosijefa.mypressonline.com/65426613730.pdf
    • https://cdn-cms.f-static.net/uploads/4460982/normal_60430bdccfefa.pdf
    • http://fafesixokegigi.getenjoyment.net/7530111621.pdf
    • http://gareduli.22web.org/como_reportar_incidentes_laborales.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3fb57d61-feae-46e0-b9a0-4c06faae2766/kimukasumekasatufejukolor.pdf
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_41c684d0da094cefae0f5ed8db511cb7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/288a5067-f68a-4cd5-9b67-578efa1c87d8/4376675754.pdf
    • http://bosurigazo.epizy.com/hul_annual_report_2018-_19.pdf
    • https://uploads.strikinglycdn.com/files/bb955261-abbd-46be-b906-2db03db8e69e/triangle_offense_basketball_for_coaches.pdf
    • http://pefimubis.myartsonline.com/78169345494.pdf
    • https://uploads.strikinglycdn.com/files/6a82ab47-b70f-462a-ad32-562378293b2e/kigutovabifazinuba.pdf
    • https://uploads.strikinglycdn.com/files/f18d439d-632c-4fc0-afd4-7d6539ef0028/which_cva_muzzleloader_is_the_best.pdf
    • https://uploads.strikinglycdn.com/files/3baa278e-2775-4f65-ab27-182aa30e745c/the_satanic_rites_of_dracula_1973_trailer.pdf
    • https://uploads.strikinglycdn.com/files/49a6a981-d655-4600-a6a3-91ae806b3df3/57733045084.pdf
    • https://uploads.strikinglycdn.com/files/1f7080ab-038b-42d2-8037-054cc5cbf0f0/metaphor_in_the_giver.pdf
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_2257082d19ca4a8486be76552db7c194.pdf?index=true
    • http://rukosivujuxu.atwebpages.com/68324264906.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_off0001014e.bin
58d084576c6394c66c68e20cdcd9ad7d2d93e73c41f13adf94d436385f094e41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 5056 bytes
font_01_sfnt_off000112af.bin
a914fbcd3ed9a617c97d15237b8f5a3062cf4cfa886c865495694181ac1946ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 11884 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.