Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe63e4c0a6871573…

MALICIOUS

PDF

111.5 KB Created: 2021-03-19 13:40:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0356be41b581f025d3508d5ca9b29ef SHA-1: b3980447362a39d44a45984c7dce632b232d1314 SHA-256: fe63e4c0a687157342f6672df5c662eb0626458368303ec56c61c5dae2de1f39
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 are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

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-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://dafemum.ru/strik?utm_term=is+twilight+breaking+dawn+part+3+coming
    • https://static.s123-cdn-static.com/uploads/4370063/normal_5ffcc0a634d39.pdf
    • https://cdn-cms.f-static.net/uploads/4374860/normal_6022e73a246e2.pdf
    • https://cdn-cms.f-static.net/uploads/4460963/normal_603553ecbd62a.pdf
    • https://static.s123-cdn-static.com/uploads/4380382/normal_5fff6021bcd5f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nedugone.epizy.com/90423341426.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_aa971f5d9dcf43d2ba579619845b10d9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/725501a1-83ba-4692-a875-5ea75d987c08/webbs_depth_of_knowledge_levels.pdf
    • https://c18d7360-3707-4bf1-9d6f-52ba7510fa17.filesusr.com/ugd/76cb06_05e6445f54b44f20ba4d817ce85f51b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f6b10c5-c178-4b07-9d69-fc40d85a2b8b/53467066278.pdf
    • http://lijobexabip.rf.gd/21805101398.pdf
    • https://uploads.strikinglycdn.com/files/320805d5-7fc3-4042-a179-2ed935b2b303/rifubetulolalanafeta.pdf
    • https://uploads.strikinglycdn.com/files/8de6c586-3d91-476e-bfc2-7f5470fa1048/300_blackout_reloading_dies_midwayusa.pdf
    • https://uploads.strikinglycdn.com/files/3ffbc1ad-07aa-46fd-beb2-ea373dd70903/umbrella_academy_comic_vs_tv_show.pdf
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_c18f5f18d94d4503b4dc7c47cff1b58e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/56742b3a-d6f2-4c25-82c9-d43a21985d6f/is_h2so3_a_strong_acid.pdf
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_98e2384333e8492fa5cf1f5a86652672.pdf?index=true
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_9c53f729e722477c8a05d0b03147e9fd.pdf?index=true
    • https://d99c26cc-8c68-456d-a039-1a26994c8d26.filesusr.com/ugd/105a8c_a2a01753995c455f9494c1e66f35eb86.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ed27636b-5179-4b13-abd8-375afd246a7e/ama_a_dios_grandemente_miedo_y_ansiedad.pdf
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_5ff9f30f29574f85836cdd26c3c6fd92.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_off000173cf.bin
e32c2536689b724ff93322a5358d74e90cd70d2422f4f5b1d7eba211182af371		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173CF 5884 bytes
font_01_sfnt_off000187ba.bin
01a11145f63e749e8b0ba08567baeeb5ead022920ddbcb04027db40c961f36ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187BA 12036 bytes

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