Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce5309e9f690c80…

MALICIOUS

PDF

95.2 KB Created: 2021-03-14 23:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 01f0630c705b715b75b320d7b1c0df23 SHA-1: 51c036c867b28314881e0170f7911d7c4aa224ae SHA-256: 3ce5309e9f690c800d73a845250271d802a4d60630b2ffa4dc77a1fb2c938a63
164 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF files, many of which are suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/123?utm_term=catia+v5+books+free PDF link annotation
    • http://lnstagramverificationbadge.com/acme_led_par_64_manual3dwd6.pdfIn PDF document text
    • http://50offstore.pro/danazarvedb2.pdfIn PDF document text
    • http://blognews.top/jabra_gn9350_battery_pack5ofjz.pdfIn PDF document text
    • http://filemarker.store/tepidebirevawewamis173y.pdfIn PDF document text
    • http://xelowonol.scienceontheweb.net/bureaucratic_reform.pdfIn PDF document text
    • http://niburufajanuto.sportsontheweb.net/how_to_cancel_call_forwarding_on_landline.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/kewakuko/tally_balance_sheet_format_in_excel.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_f1e4c416e1024a61b8bfffed7376d72d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/kovalerixupuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/isola_ecologica_casinalbo_formigine.pdfIn PDF document text
    • http://solezod.myartsonline.com/which_institute_is_best_for_software_testing_in_bangalore.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/27521639084.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/88488022346.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/singular_and_plural_nouns_second_grade_worksheets.pdfIn PDF document text
    • http://degavitorepapi.rf.gd/60217618841.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/xuxuvazexu.pdfIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_a39f67be72b141c381d9c11c24374f67.pdf?index=trueIn PDF document text
    • http://lejonawazemu.rf.gd/neramawanineneperaxe.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_off00013338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13338 5020 bytes
SHA-256: d4c762fb4281e6980da1a384442bb0022942fe5decb28a9d47d6c372fda103d8
font_01_sfnt_off0001446b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1446B 13112 bytes
SHA-256: b9a498f5b6d933552228ae1ae2195f04641ebd0df416b15bd5557b8c9a4171fd

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