Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa8d04fc77b458a…

MALICIOUS

PDF

75.4 KB Created: 2021-02-24 23:32:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b879c34b7be6876cbdca72dd0d4a0a69 SHA-1: 766b9eadbcc77c84b349b1f063a37d4930eb6ba9 SHA-256: 0fa8d04fc77b458a0ab46d1680546353e5712494ba5000a96dfac99cd963980a
96 Risk Score

Malware Insights

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

The PDF document contains a lure related to QuickBooks, directing the user to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://maypoin.ru/award?keyword=how+to+show+a+voided+check+in+quickbooks PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4463807/normal_5fe120ec1eee6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_600a79c1391b4.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/icebreakers_for_kids_online.pdfIn PDF document text
    • http://vexidizagopukib.22web.org/how_do_i_connect_my_hp_laserjet_pro_400_m401dn_to_wifi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473410/normal_601d20f706b09.pdfIn PDF document text
    • http://card2card.live/which_is_better_inkjet_or_lasermhe4w.pdfIn PDF document text
    • http://digosige.mywebcommunity.org/how_to_drive_a_trailer_in_offroad_outlaws.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455194/normal_602f41bdc08bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xejarejunap.rf.gd/contax_g1_90mm_review.pdfIn PDF document text
    • http://pagujuropiwadiv.rf.gd/film_alif_lam_mim_2_lk21.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/amanush_bengali_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/labitajaxatufib/smokepurpp_audi_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/backpacking_thailand_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/korean_action_movies_with_english_subtitles.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/79076405362.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/87361204660.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 5224 bytes
SHA-256: d55b3fdb821cbeba50b64bdf7f5aa01887b550fa7ab2eba6984c30e2ec440344
font_01_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 9836 bytes
SHA-256: c42303ce9e1071b9c6329f4bb36186aa18b830bb54efe4dfa138c2dd67731847
font_02_sfnt_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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