Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9df93c551ff27eb…

MALICIOUS

PDF

75.1 KB Created: 2021-02-27 18:52:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 85185f3038386671d232e3cd1d08fb61 SHA-1: a0ecdad0759d362d22238ebd5e3008a6e9747ce4 SHA-256: b9df93c551ff27eb11ce3f4ba5908ecd27a8639e70b7d537243a5d057cc86b50
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/wb?keyword=spider-man%20cartoon%20spider-man%20cartoon%20dikhao PDF link annotation
    • https://cdn.sqhk.co/pevelefotuve/jhUljgF/ark_survival_evolved_ps4_price_philippines.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/ugeggPH/mens_hairstyles_medium_length_fine_hair.pdfIn PDF document text
    • https://piligerababuge.weebly.com/uploads/1/3/5/3/135324290/2035331.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/35804998923.pdfIn PDF document text
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/tonexaki.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/blackmagic_design_atem_mini_hdmi_live_stream_switcher_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/befafuni/bus_simulator_vietnam_free.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/xumiwewi.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/51317202622.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/marafipenatonu.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/nintendo_wii_console_bundle_new.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/android_animation_tutorialspoint.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/xizasipikonivoronanidak.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/what_is_the_best_alexa_for_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/bifepaberuvejiwuwupeta.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71A 5480 bytes
SHA-256: 17787dce9a9d4bf7a340a37872ac6fa35420d7b187712d938373f6e9677b9fd4
font_01_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 11176 bytes
SHA-256: aa06d15480bf72f38278002f8080c2ee39b9068b47a1f0a8090e4ac1119182e6

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