Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa01a5b96b67703…

MALICIOUS

PDF

89.0 KB Created: 2021-04-07 06:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 788b4c78be4c187c48132d5727bb7616 SHA-1: 1b00d352a6bb39d5438a2841f73a8338cf78d835 SHA-256: aaa01a5b96b677035e118bd8ffb55aa991b9652f0d0c8b2fc3b70e80902ed219
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://dugedepap.ru/123?utm_term=aspirateur+sans+fil+pas+cher+et+performant PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490528/normal_60251fdf06519.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5fcfadf383a57.pdfIn PDF document text
    • http://jizerigozigalav.getenjoyment.net/capgemini_quantitative_aptitude_questions_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/jibggng/52208473464.pdfIn PDF document text
    • http://creditreportfast.info/zepefenifygy0.pdfIn PDF document text
    • https://cdn.sqhk.co/raxedaninaso/bha9QAY/22046897862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_6064e08a510e3.pdfIn PDF document text
    • http://visiblawty.com/woduzume19p5a.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/jcjeIlv/gunship_battle_3d_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/kiviziko/jchethd/genki_workbook_edition_2_answers.pdfIn PDF document text
    • http://copyright-infringement.business/bulidetin664u.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/sojenozap/benyamin_biang_kerok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5801a1a9-1c58-428a-a98c-162cbff1dad2/the_stars_are_coming_out_tonight_david_bowie.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/circular_pro_font_free.pdfIn PDF document text
    • http://bukezodebas.onlinewebshop.net/rukozumugexiluki.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/balofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dbd4465-c00f-4656-a4cf-a8630b2d5159/9093420923.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/jelobamaruve.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_off00011ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCF 5244 bytes
SHA-256: 32a01181dd03a6c6a13ce14d77231cbe2ec34b4ade91e038b528c25b6e65fb05
font_01_sfnt_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 12444 bytes
SHA-256: f157fbeee0117d7ef30df7db5a7cb0abcd7ff78ff93a7224da44b5666123b982

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