Malicious PDF — malware analysis report

Static analysis result for SHA-256 684b6d5cbfcd8814…

MALICIOUS

PDF

77.4 KB Created: 2021-03-23 11:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: afecb086e5d82e4dc721bd133e23ded0 SHA-1: 6a0dd81851f4915099376a6016c14fd305dc008d SHA-256: 684b6d5cbfcd88145aa113bfc856d20c8dea03036380ac3259f2434c33b5d441
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 point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/123?utm_term=cakewalk+rapture+pro PDF link annotation
    • http://alcexpress3.xyz/25947702037aq4o9.pdfIn PDF document text
    • http://boomerangoo.site/carpentry_for_dummies_free_download75c7r.pdfIn PDF document text
    • http://pollsexpert.com/49933510854800m8.pdfIn PDF document text
    • http://zhenskiizhurnal.ru/45365009036kdqpu.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/hneijic/love_failure_ringtones_telugu_download_2019_naa.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/61875986629rxd0m.pdfIn PDF document text
    • http://yeswins.space/overcoming_gravity_reviewmrnnd.pdfIn PDF document text
    • http://ashotik.space/50587243354gkz10.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/husqvarna_455_rancher_chain_size3j79s.pdfIn PDF document text
    • https://cdn.sqhk.co/lafixafif/62xjhie/defence_zone_3_hd_unlimited_money.pdfIn PDF document text
    • http://ductsunlimitedins.com/muxaxutozewudodiwuankfb.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/mexijegedakol/inferences_worksheet_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/arma_3_exile_server_guide.pdfIn PDF document text
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_122dfaf507cd44be92f04c400bc161e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wejuvono/kozenibofotada.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/67619974955.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/66185125233.pdfIn PDF document text
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_4a24ad6a28b644d1973a3e8df84634ad.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_8c4c11858cee473ca32f9947a04995ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/how_to_use_a_polaroid_is048_camera.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_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 4696 bytes
SHA-256: bd955561e9372712bcdbd38ccea49f0cebae694f695d599b40e699a7494d6235
font_01_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 11108 bytes
SHA-256: 7821d515d14882562f7357d27e5d0b48f2f257f2431691c7b615a678613c51ff

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