Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b411c12088191fe…

MALICIOUS

PDF

69.8 KB Created: 2021-04-02 21:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2a8e21651195c7eb4b0697a617cf880c SHA-1: 9fb5ccba749996a8c796ab56a7eff5adeb895a0c SHA-256: 3b411c12088191fe76ef2ea50ad9172c212fb28e8b4fe78b952f03d53124ece5
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-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://nipisod.ru/wix?keyword=microwave+engineering+pozar+3rd+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403816/normal_600fd9968b20d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_602bb6f140b42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499319/normal_5ff5f8d704ccf.pdfIn PDF document text
    • http://xejevojesinil.22web.org/44423327570.pdfIn PDF document text
    • https://xutezanepone.weebly.com/uploads/1/3/3/9/133999331/tifimib.pdfIn PDF document text
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/bojisekemozugufuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416790/normal_5fd9adf514c60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_6018eda7c8812.pdfIn PDF document text
    • https://vezudarelewik.weebly.com/uploads/1/3/1/4/131482962/jojamidud-texira-gudox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://beturatigamoli.epizy.com/vokuboli.pdfIn PDF document text
    • http://momalovategur.rf.gd/what_is_mapping_in_qualitative_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21b1e569-a80c-4d52-bef1-493e9f88a664/john_dewey_high_school_staff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ae7f7b8-43e2-4e7c-bfe4-04da80ace18c/monatuwurirelaguzifobiju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34eeeeb2-0658-4af2-a8a2-a8baca3f8229/death_cure_movie_free.pdfIn PDF document text
    • http://dozafuzap.epizy.com/pneumonia_adquirida_na_comunidade_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2491c5d3-3117-4ba2-a7e9-b73915926bc5/penoxataruwi.pdfIn PDF document text
    • http://texatutegelemov.rf.gd/5404835418.pdfIn PDF document text
    • http://nopexuwub.rf.gd/free_windows_10_32_bit_terbaru.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_off0000d435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD435 5484 bytes
SHA-256: ae1e4ed91f5bb3748e1bb0719efd91c9df2a09fd7d68dddd035ca9beae34a934
font_01_sfnt_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 10256 bytes
SHA-256: d7871a86cc16da1c1a2e02f4a2d7dc87859d7575bbf293169ff18f8c69835269

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