Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b853915fb146e9…

MALICIOUS

PDF

72.6 KB Created: 2021-03-25 13:25:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 18fc9e138962bb6d7f2d1bdb290af9ae SHA-1: 2f4ea0cd8a05d2e4019d99c373dbc15989f9b355 SHA-256: 80b853915fb146e927d8967e956abbe5de63ec5163bea3a551a999ea05cfd04a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to direct users to potentially harmful sites. ClamAV detection and ML classification further confirm its malicious nature, likely for phishing or malware distribution.

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 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=electronics+and+communication+engineering+books+pdf+free PDF link annotation
    • http://usacreditmonitoring.info/84066671693lkm1.pdfIn PDF document text
    • http://roxedizusugu.mywebcommunity.org/hp_motherboard_bios_reset.pdfIn PDF document text
    • http://wisitens.online/how_to_sign_up_for_prodigy_mathdswt6.pdfIn PDF document text
    • http://magicwoolshop.com/13241941103fmlik.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/standard_of_excellence_jazz_ensemble_method_guitar.pdfIn PDF document text
    • http://sakaxek.mygamesonline.org/80468775022.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/boziju.pdfIn PDF document text
    • http://skidki-day.shop/dynamons_world_mod_apk_wendgamesaohaz.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/59184641660.pdfIn PDF document text
    • http://just-gopro.com/how_to_download_thinkorswim_on_iphonesz9q9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_7f2bfdf3783447b1b55a51cbf426a084.pdf?index=trueIn PDF document text
    • http://rusiwebo.epizy.com/cetoprofeno_bula_gotas.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_9b429b95ff274063962cb20b0b11d0e6.pdf?index=trueIn PDF document text
    • http://xaposekesudonod.epizy.com/80219957633.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/grove_scissor_lift_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/aol_mail_app_fr_android.pdfIn PDF document text
    • http://dorediludopa.epizy.com/pipozupinipofiwetok.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/harrisons_manual_of_internal_medicine.pdfIn PDF document text
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_d54b233a62794d258a0118d37ec5bdc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuses/gagiremixeso.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_off0000dc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9E 5636 bytes
SHA-256: 547c0de4b59bb1177a227392d819f10a6bde4355ff8abd7db3e31d013c3fd978
font_01_sfnt_off0000efb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 10916 bytes
SHA-256: b81cc9c3e7fd4ec00e749403cf9d313a2ad91ecdc8eacc37b21f9354c4a52e4b

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