Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1b566b40e06bf3…

MALICIOUS

PDF

78.7 KB Created: 2021-03-30 08:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb8d9f8f5f660087c509c6a7bda9304f SHA-1: 6e598398598c0cab8409fa06ea8cfc7146974573 SHA-256: 4f1b566b40e06bf3f33a551d012af51e691a8d79a43b4bf2d59577a609c94324
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 hosted on dynamic DNS services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the embedding of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/123?utm_term=the+accidental+tourist+summary+pdf
    • https://pegojuzifaxoda.weebly.com/uploads/1/3/5/3/135309499/6398372.pdf
    • https://vejazejama.weebly.com/uploads/1/3/1/3/131381369/5f93b.pdf
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/vuzulat-woterokelurupi-lujasibexadep.pdf
    • https://dunojezeb.weebly.com/uploads/1/3/4/5/134586234/f8837.pdf
    • https://xiwajuropoji.weebly.com/uploads/1/3/4/3/134371127/2905311.pdf
    • http://idealica-uficiale.website/articulo_123_de_la_constitucion_mexicana_completouku5i.pdf
    • http://digtalcaliper09.xyz/42912883560enpsn.pdf
    • http://nakenanizugaxit.iblogger.org/tixanirunepajajewexobo.pdf
    • http://fovejawurolugaf.iblogger.org/kegeditojov.pdf
    • http://gmetry.online/gebadozakokaktn5j9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gosufixo.rf.gd/learn_excel_online_youtube_in_hindi.pdf
    • https://s3.amazonaws.com/bisegilupuf/6014730439.pdf
    • https://s3.amazonaws.com/tutapaxi/simple_electronics_projects_for_beginners.pdf
    • https://s3.amazonaws.com/gonima/pandaria_flight_trainer_location.pdf
    • https://s3.amazonaws.com/ziwuvijevo/94678381385.pdf
    • https://s3.amazonaws.com/teximikamukubo/zezunirubasokagem.pdf
    • https://s3.amazonaws.com/tokatefozude/andante_meaning_sheet_music.pdf
    • https://s3.amazonaws.com/kefiperizonofu/marshall_avt150h_manual.pdf
    • https://s3.amazonaws.com/tubupejevomo/merelenavanezikojujiluvoj.pdf
    • https://s3.amazonaws.com/wejuvono/minn_kota_repair_manual.pdf
    • https://s3.amazonaws.com/negonanopix/liniburikategivaxojesir.pdf
    • https://s3.amazonaws.com/dubiditiginowo/55967273823.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_off0000f663.bin
72b91213e258091e0d19e6f354a9e3ff64739e6e02903928262ecea6318b172b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 5444 bytes
font_01_sfnt_off000108c2.bin
408415fbcb775c5943b9e20182fc2472ffdea7e6c637a104167896d0c14807a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 10804 bytes

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