Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e7f03393be4b7b…

MALICIOUS

PDF

75.8 KB Created: 2021-05-21 08:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cd6653a5158a65351515b4538cfc21c2 SHA-1: da715bb162f9ad066e13dec85e7ad8053c93a131 SHA-256: 83e7f03393be4b7b870ac4ee6b0eb08e3dd5e742f7b13d12a8457d9483bec3cb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://golowaki.ru/strik?utm_term=paul+marino+icu+book+latest+edition+pdf+free+download PDF link annotation
    • https://makaxifosezopuv.weebly.com/uploads/1/3/4/5/134511124/wuwimomemigapo.pdfIn PDF document text
    • https://logikepuni.weebly.com/uploads/1/3/4/4/134459966/fc25adf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367625/normal_5ff06146f3f67.pdfIn PDF document text
    • https://gatepeduvemixif.weebly.com/uploads/1/3/4/6/134669895/d29cb81d386ce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403947/normal_6061ef1fc4394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414691/normal_5feb691a1d734.pdfIn PDF document text
    • https://bojebunu.weebly.com/uploads/1/3/0/7/130775379/8e2dea8c.pdfIn PDF document text
    • https://zepitobazelaki.weebly.com/uploads/1/3/4/6/134619491/vezuwamowax-dirafufali-jivojokulakevu-fukijuretij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465908/normal_5fdeccb0c7325.pdfIn PDF document text
    • https://tigigedilopufam.weebly.com/uploads/1/3/5/4/135400960/9712207.pdfIn PDF document text
    • https://jepuderakemuso.weebly.com/uploads/1/3/4/6/134666912/1724205.pdfIn PDF document text
    • https://witaveju.weebly.com/uploads/1/3/1/4/131452735/deguv.pdfIn PDF document text
    • https://jotesufuxave.weebly.com/uploads/1/3/1/4/131483421/tizam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_60486678eae49.pdfIn PDF document text
    • https://zokibiruxe.weebly.com/uploads/1/3/5/3/135326092/domuduxiku.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/litunux/49861816150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7c22fe-9581-48b1-9402-cb91c2a5e96a/32936301809.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/42749615946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297bb3ff-9331-45e6-99c6-962f6dc41b6b/romeo_and_juliet_1996_streaming_ita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/159f1718-95a6-4b1a-a79e-97533ccf5282/maxiscan_ms300_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a59641-da84-45d2-bb8a-6ff74a33faa0/what_is_supermans_motto.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/fun_printable_christmas_trivia_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/how_to_build_a_simple_drone_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/wowid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a28b15-22bb-4d50-9210-f3263c030dab/7619409428.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/antrenmanlarla_matematik_4._kitap_indir.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/65720290222.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_off0000e9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A0 5600 bytes
SHA-256: 47884e3e8c77d4a267ad91b72b6d625ef0cc6f1ccc1bf4b5917cb3229f37296a
font_01_sfnt_off0000fca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 10824 bytes
SHA-256: 4100e9f4488053eb305a78a2089c7f1f4aac71038d393826b4207294c80cfb0c

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