Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73bcdfd7cb49085…

MALICIOUS

PDF

81.2 KB Created: 2021-03-06 17:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8708b69f56420b0fcfdd6a54421751fc SHA-1: 3b495fb408f0b1939fdb1c66d21655d769eb725e SHA-256: b73bcdfd7cb49085c29a1b3d22f6eb0bef16a0dca286a5d1bb63af75739940b5
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 0.9996

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://dugedepap.ru/wix?keyword=chapter+9+skills+and+applications+drivers+ed+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407084/normal_603f49abf18bc.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/bjbhgaO/sikid.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/hhijbhj/doot_doot_skeleton_transparent.pdfIn PDF document text
    • http://vpntop.info/maths_book_class_7_solutionsuzqhz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450719/normal_60029b9d78ded.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/jdghoFE/79637163401.pdfIn PDF document text
    • http://lollipopa.online/nejojarokibojoxukifamopad15sa.pdfIn PDF document text
    • http://perevod-card2card24.site/897945752255o5dl.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/hSXomia/most_relaxing_cruise_ships.pdfIn PDF document text
    • http://babysampler.com/wimapuxonegugoviseztfy0.pdfIn PDF document text
    • https://cdn.sqhk.co/kalusoxat/jgNhh83/61327321829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_51976e04f4694578bf330cec91e4a81a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2c7146-1256-4b6e-aac4-278636c1c589/tovekop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a6ae692-7971-491e-9ed4-bf60ef15e307/salario_dos_delegados_da_policia_federal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eb89d2f-f9ce-4b21-a1ba-6d1c3fa0c341/degubuxo.pdfIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_19d55ce49bf14f158b6b8d54cecc6786.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_6e9eb65b93c649f3bd7869de2b3192f7.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_5b371aa17ccb4806a7362c48ae1ac5bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00e9d50e-e2bf-4614-9957-265a0c780520/70576538948.pdfIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_026ba8afb9ee40fe8875b5b68aec36c9.pdf?index=trueIn PDF document text
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_3ea6ecffa99c43ce9f227a415ccbcc14.pdf?index=trueIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_ebaf751880fd423fb2c376c0928bd595.pdf?index=trueIn 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_off0001013c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 5436 bytes
SHA-256: e5afc5b9c4f1bf88b3dacdbffc8c7099b55e90ba519ff372fd543d95a31ec93d
font_01_sfnt_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 10412 bytes
SHA-256: 2e1ff20e4c71f7bbf4b1f396323d70e08cbd67e0dbddac6a8b5167f7e4d54fe2

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