Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04a7fcd827f4a4e…

MALICIOUS

PDF

71.0 KB Created: 2021-03-04 09:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 75ad06b640c9cd250afbd16e54d35e60 SHA-1: b9765f71c770090f0bd6b5b632f463718c905ca6 SHA-256: e04a7fcd827f4a4ed21286b5e7e188deb587af579cb4b3fd4f85def33c0ca194
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://baarspo.ru/strik?utm_term=how+to+write+in+an+engineering+notebook PDF link annotation
    • http://antinomi.design/how_to_teach_singular_and_plural7byaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_60289d13db0ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fe64c07f1f11.pdfIn PDF document text
    • http://sy0n.icu/wixixasusunjj802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_604024bc8121e.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/cambridge_latin_course_book_1_tremores_answers.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/how_to_connect_arc_to_receiver.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/jafekevelanuvo.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/14405939556.pdfIn PDF document text
    • http://tricitysikhs.com/traxxas_nimh_battery_charge_timegpcfu.pdfIn PDF document text
    • http://evatopshop.xyz/pabufemopumo2gaku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_6017a623cdd28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bebovufuvuji.myartsonline.com/ms_access_2007_tutorial_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/kinetica_ps4_trophy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/comment_organiser_des_sessions_de_formation.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/house_of_usher_quotes.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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 4900 bytes
SHA-256: d1b66058692649ae844733cc39148f023760a376b1ebb7b98794f41cbc8cdcb5
font_01_sfnt_off0000ecce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCE 9972 bytes
SHA-256: 57e1015e2904cc9ee39fe58de7892b3748201852e6ea991378d987e8b5a51bcb

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