Malicious PDF — malware analysis report

Static analysis result for SHA-256 4000c3e8fb51695a…

MALICIOUS

PDF

75.6 KB Created: 2021-03-22 07:05:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 66981496be09c0937035e0a2c4399da9 SHA-1: 68bb9131c452e6515358dfe14665f077cefba8b0 SHA-256: 4000c3e8fb51695a66cd3cdfe0359f81df5451afe317498a69a2034548931dd0
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is part of a link farm, with a primary URL pointing to a site designed to appear as a search result. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to a compromised site.

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 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://pelibifir.ru/award?keyword=wajah+bandung+tempo+doeloe+pdf PDF link annotation
    • http://mattelipsticks.site/mecanica_vectorial_para_ingenieros_estatica_solucionarioxeuaq.pdfIn PDF document text
    • http://mnclassis.org/rf_magic_controller_user_manualv4shg.pdfIn PDF document text
    • http://irisca.online/best_manual_tile_cutter_on_the_marketnmhzu.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/lodazojamuva/small_bow_tie_template_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/45335918678.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/80605521052.pdfIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/97728979668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c1c3af7-701b-4697-be01-2a55916b6d89/feeling_is_the_secret_book_review.pdfIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_2bf88c0cdcca49cc9d99c37c8a834c25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e56ddbb8-da6d-4af8-a60f-0169987b5d08/what_is_catholic_definition_of_grace.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/google_plus_apk_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15311e7c-f0d8-485c-afb6-b84775b8c682/mejizekugu.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/aio_er_apk_for_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/87022870714.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/sad_boy_cartoon_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/30395875993.pdfIn PDF document text
    • https://fa0867c9-8cf0-46f9-bfae-aad8e49c21f3.filesusr.com/ugd/cdba2c_3c8090ef232c481b8e5a245e2e9367e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/basoj.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_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 5412 bytes
SHA-256: 5720c489522303cb04a8aa8ac41214d97128af34992c5b407f14e1cf33746cfd
font_01_sfnt_off0000fc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC89 10628 bytes
SHA-256: ec2d5df909d3eb03d00181d4695c1c154e30cd2609fbfb15081d096652323744

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