Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b21f412692ad58…

MALICIOUS

PDF

82.8 KB Created: 2021-03-31 09:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 45d4e8f7ace3208fcc7a8465257bfac5 SHA-1: b22db1fe2374f523802e6d0f5b3938c961a871a3 SHA-256: 65b21f412692ad58a4dd0e99e65761c21c42c70aace83ea48fbbc0aae2559358
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/award?keyword=bhaktamar+stotra+kannada+pdf PDF link annotation
    • https://kekisuganuzab.weebly.com/uploads/1/3/4/7/134721312/96b8490e8d60c0c.pdfIn PDF document text
    • http://wisitens.online/emotional_support_service_dog_letter_template23e7q.pdfIn PDF document text
    • http://mini-camera-super.club/2007_aha_guidelines_prevention_of_infective_endocarditismcmum.pdfIn PDF document text
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/25487.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/vujewilitidif.pdfIn PDF document text
    • http://jakufodunod.getenjoyment.net/the_visual_encyclopedia_of_science_fiction.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/28654722277.pdfIn PDF document text
    • http://jevebolutu.iblogger.org/55039357489.pdfIn PDF document text
    • https://rarekupop.weebly.com/uploads/1/3/4/0/134012473/dogeduvoxutefur-jakotawefipo.pdfIn PDF document text
    • http://ndfnasg.xyz/wuzapaxuvaveberavizgfa3t.pdfIn PDF document text
    • http://soldonlittleton.com/80244569260i0sqv.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/80816140117.pdfIn PDF document text
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/zixunepi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://xagivetiji.epizy.com/ipod_touch_5th_generation_amazon_music.pdfIn PDF document text
    • http://sosozodazu.epizy.com/85470193168.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/mogupaxubelunuru.pdfIn PDF document text
    • http://gazadimo.rf.gd/21335206357.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/77437313325.pdfIn PDF document text
    • http://wejufutaz.onlinewebshop.net/how_do_i_connect_my_epson_printer_to_wifi_without_cable.pdfIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/abruptio_placenta_acog.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/nasirowasenidowaj.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/d-_day_tourist_guide.pdfIn PDF document text
    • http://katilujovuge.rf.gd/77111765186.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_off0000f75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75F 5360 bytes
SHA-256: 9ba0ad065cf27f7084349f8cfa28e7e2d768b2772c78306c65c55b3219f2bef7
font_01_sfnt_off00010972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10972 11372 bytes
SHA-256: e7c4e3d3e3896cb6235d1d4298511defa6ab06e8c8f5c2e61752029e58f5b7c6
font_02_sfnt_off00013063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13063 3444 bytes
SHA-256: 31ab0913a5f35130bd393ae0f004882333ce96d24c6814ceebaf32ab56413060

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