Malicious PDF — malware analysis report

Static analysis result for SHA-256 8597e9420cd8a8a1…

MALICIOUS

PDF

80.7 KB Created: 2021-05-29 04:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8d2adeb405944604154bc1ae91e340e1 SHA-1: 6b0592bcb197f9e345441e128c447ce30d647801 SHA-256: 8597e9420cd8a8a13a4f438cf0e3d0c91b12a23da3bb45a2e953ca3fc8e701da
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://lozipotod.ru/123?utm_term=dynamics+365+outlook+client+user+guide PDF link annotation
    • https://girusetobar.weebly.com/uploads/1/3/1/0/131071114/8449157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471455/normal_5fec032093510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_6039e68bb8d92.pdfIn PDF document text
    • https://zinawadasug.weebly.com/uploads/1/3/4/3/134312837/7767827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_60468dd748b51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_60629f84031ac.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4426409/normal_60b165e14bfd8.pdfIn PDF document text
    • https://wizaxonaguwaxi.weebly.com/uploads/1/3/4/3/134306690/fasejusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367947/normal_603cab1b4edda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_60412333cc4c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_602af1bca730c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422628/normal_6035ec6e87268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427498/normal_6008ff1831964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_5fdc3c2f8fe8c.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/2a57fafdab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_600e304acf52c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc81751-da19-41a4-820b-7e150cc65f9f/derek_prince_youtube_blessings_and_curses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/177d86ce-260b-474c-b75d-6ae07a343c4b/le_quadrant_du_cashflow_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24b9955-ce01-4473-957b-fb3ab7730076/what_type_of_symmetry_does_a_sea_anemone_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f8b78a5-35af-4007-bdeb-bb1dbfe892fa/9671103818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15262a3f-3015-4d49-9d07-e0d5a61ed7d3/raizes_do_brasil_sergio_buarque_de_holanda_resumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc3295e8-945e-4b04-a355-b56c6f340ca0/54166973992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5e575f-9d08-4d9c-bb6a-08ff7aaa00b0/50943318757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e6c7a2-8a76-4329-9c08-1edbf1f3b2a0/bardo_thodol_summary.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_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 5864 bytes
SHA-256: 5cba239bcbcba5f27c17439641fd52e7123666eeaf7e3880acf5543221deacf5
font_01_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 10992 bytes
SHA-256: 7c1a23672f4a10abf7b19345715e4d4310bcd588296fba316e3544a0c9d05dd9

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