Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd52ae5e35673aa0…

MALICIOUS

PDF

83.7 KB Created: 2021-02-28 08:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3738bb8d7446df8b5635c31075f961f1 SHA-1: 948d49092d366f904b8f20303b1f89b286c23910 SHA-256: bd52ae5e35673aa0ce48f7a93c5a2bcbb521354cba688752f59abe8d28d08800
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous external links, with a significant number pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the overall structure strongly suggest this document is designed to redirect users to malicious sites, likely for further exploitation.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=al+tawbad+general+trading+and+contracting+company
    • https://cdn.sqhk.co/lorotukogof/sMDpjez/42150579689.pdf
    • http://vatidenow.medianewsonline.com/cuanto_tiempo_puedo_tener_el_carnet_de_conducir_caducado.pdf
    • https://welukixavise.weebly.com/uploads/1/3/1/0/131069839/332.pdf
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/2771799.pdf
    • https://lukawonudos.weebly.com/uploads/1/3/5/3/135320707/8948595.pdf
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/gizugofomijuzo.pdf
    • https://besuweleterum.weebly.com/uploads/1/3/2/8/132814030/2566246.pdf
    • https://reropazorulofo.weebly.com/uploads/1/3/4/4/134437501/wanuwuzofinaxa_jemedijamazogo.pdf
    • http://nekuwagibajese.getenjoyment.net/best_electric_ice_cream_maker_recipes.pdf
    • http://fulusixavopowem.iblogger.org/xunesinixopape.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dijasogowupa.rf.gd/jekenizasid.pdf
    • http://duwemanuwixam.atwebpages.com/59015277484.pdf
    • http://gelutusuxipedib.rf.gd/zavolotuxojevalalopob.pdf
    • http://bigisewolax.epizy.com/kit_dls_2019_juventus_2020.pdf
    • http://zitadufafasid.onlinewebshop.net/how_to_hook_xfinity_cable_box_to_tv.pdf
    • http://vikogen.epizy.com/resume_template_for_lots_of_experience.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc23.bin
0a58bdb7e9f404a1198957833edc863841df539d09f3b215e0befbe723dcd64c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 5324 bytes
font_01_sfnt_off00010e2f.bin
a6f7bfe18d6a4eb1dc33d00def60de5f80fd68a28b0220662f2d41638a0a1c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 10752 bytes
font_02_sfnt_off000132e9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 4324 bytes

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