Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9caa06cc9f02f6…

MALICIOUS

PDF

75.1 KB Created: 2021-03-19 05:00:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d14e3d0b204e4f77ebcba5108ddc313 SHA-1: d657a86eafe4f31f5b57ca7aba4177384c41564b SHA-256: cd9caa06cc9f02f64064154f59f6d8981b0bedbfe4207e04d17787d619b9080d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary links, 'https://midufefew.ru/aws?utm_term=explode+the+code+1+2+3', suggests a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the extensive link farm points to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/aws?utm_term=explode+the+code+1+2+3
    • https://vinebikeja.weebly.com/uploads/1/3/4/7/134712271/domirujul.pdf
    • http://trafikcezaodebayisi.com/compare_and_contrast_prokaryotic_and_eukaryotic_cells_using_a_venn_diagram5tl13.pdf
    • https://jiwifibim.weebly.com/uploads/1/3/1/4/131437351/874055.pdf
    • http://kalavar.xyz/91945302741vidcn.pdf
    • https://suvoneretalepa.weebly.com/uploads/1/3/5/2/135299969/zinaxa.pdf
    • https://witomoniwitu.weebly.com/uploads/1/3/5/3/135317652/2273745.pdf
    • https://zezonusadife.weebly.com/uploads/1/3/1/4/131410479/0337a86.pdf
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/pesukuxetemew-remenutifi-kafoduzefew-tazemeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tedowafomaru/all_in_one_bootloader_unlock_tool.pdf
    • https://s3.amazonaws.com/genijusemu/panasonic_phone_battery_hhr-p105.pdf
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_9fc49a4bc8e14f509f78707cfc310538.pdf?index=true
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_1b481d998542456199d12968948b8a07.pdf?index=true
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_b564617202e14273b4deeaf2517f1ad2.pdf?index=true
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_6bff9edac91548989f152058da460bdc.pdf?index=true
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_91522d79cc0348be89260c99f512578e.pdf?index=true
    • https://eda15335-3b41-4752-a6ea-ca28a3d9ec24.filesusr.com/ugd/db55a9_ef60405482124d8b8e496c7188148bf9.pdf?index=true
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_e7203c66e5f2461487c86ec9c5adb06c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea21.bin
ccc6944aa09a8ff64a7bb7a7e080511a6d2a46436a1b8d210ea95b8d4ae2bd08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 5048 bytes
font_01_sfnt_off0000fb62.bin
f7af6244ec599717e1db7f3beb0dfeb15c1ecc8ae5bbf64adce8666b85e7fdb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 10772 bytes

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