Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7661a82f91056b9…

MALICIOUS

PDF

132.0 KB Created: 2021-03-20 21:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fd80c1176568f99dc2d9d83a4b9fda08 SHA-1: 59a118ffbc9ee1c896a7575276303d92997cc0de SHA-256: d7661a82f91056b90f057ef992b2e7dca43eab819da6642b1dd2d313d32e6866
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 0.9996

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 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://lozipotod.ru/strik?utm_term=what+is+the+social+contract+rousseau PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd262b50d7bb.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/gjPGvii/10318644108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489422/normal_601806d552dab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_602fd91fe8a94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5fd069935ab10.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/jighcZk/53990424761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_602f7a37055e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421333/normal_6005dff651f4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392659/normal_6048e1dfcd747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_6041cb98a63ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380523/normal_5ff70f91a6729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5fd2da3e0144e.pdfIn PDF document text
    • https://cdn.sqhk.co/fuperule/ifLAQge/kulegekifa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369317/normal_5ffd219044a83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424405/normal_6051b627c6005.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370071/normal_60063139f2959.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/88587ed4-533e-4fde-8234-5e7ab7675596/resumen_del_capitulo_1_de_la_novela_el_reino_de_este_mundo.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_bca1bfd2eea04addb7d9432726c9e95e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2184c4f-b06d-4388-bec8-85357ccfa9db/mockingjay_part_2_book_vs_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84af2f26-3c6b-43c6-8b4f-e5a6552ca1fa/78420004860.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_436f78e38bd146de8f6e47f701bf05d4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC39 4780 bytes
SHA-256: 2c6c33c0f6970b7d63efb60bca74cf3e2a2adad8eb074ed1954467b2959d3ae7
font_01_sfnt_off0001cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC72 11876 bytes
SHA-256: 2629951c97d58cc114d30b5942964b81418741e3db6fae181f8724df003344f3
font_02_sfnt_off0001f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3CB 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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