Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5ad62c9c557b85…

MALICIOUS

PDF

79.7 KB Created: 2021-03-19 12:14:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 451eebcec0a623014a7af131facd1d94 SHA-1: 343fa3cbfb651063df4d9cb4d302eb3e89103700 SHA-256: dc5ad62c9c557b85aada2bef71af883bfa0c8f14543bcd2fa9dd45228eeaaed3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to search engine optimization and university rankings, likely serving as a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/wix?keyword=yerevan+state+university+ranking
    • http://litvinenko.xyz/gixinifaymfi.pdf
    • http://magnitoli-2ekran.site/ponulukoxusexomh381d.pdf
    • https://cdn-cms.f-static.net/uploads/4388627/normal_604b859ff2980.pdf
    • https://static.s123-cdn-static.com/uploads/4411511/normal_5fe20b741b04f.pdf
    • http://znakomstva69.space/85583084447osjz4.pdf
    • http://akillidestekbasvuruformu.online/game_online_hay_cho_androiddr3fq.pdf
    • http://tesocoin.online/android_device_manager_forgot_passwordsk37d.pdf
    • http://life-news.tech/jevupemuluxesopigamosn2hfb.pdf
    • http://frukt.fun/journal_number_3_gravity_fallss0qtu.pdf
    • http://monstergym.ru/bujubavebonizafupiqdsan.pdf
    • https://static.s123-cdn-static.com/uploads/4454424/normal_60051f3228115.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3f41f27c-f55b-4d64-8c8a-7e488f56b8c0/what_are_the_4_types_of_intermolecular_forces.pdf
    • https://uploads.strikinglycdn.com/files/d4cc2e6e-e1be-4024-8af4-fbfbde026912/huffy_44_composite_portable_basketball_system_manual.pdf
    • https://uploads.strikinglycdn.com/files/ed0503fe-c6f7-4bcd-ba44-9e3d5d7c8d9d/how_to_fill_a_evod_vape_pen.pdf
    • https://uploads.strikinglycdn.com/files/ba3b35fb-3202-425a-85ed-fefd2bd42e8b/how_to_become_a_manager_in_healthcare.pdf
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_3d9ad75fed254281beaf3489a1104a1d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0be2abcf-95c1-4a28-bbc8-831dc68f38aa/93368889526.pdf
    • https://uploads.strikinglycdn.com/files/e49a590a-bf0c-40c8-95d2-2b860372537d/why_are_central_chemoreceptors_only_sensitive_to_co2.pdf
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_45fb1b9908c540a385ec8fe2040ede1f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/00de756e-ea14-4eed-9c76-b4e15d3eca60/7398187311.pdf
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_d394826eec064c718ed40a65383af2e1.pdf?index=true
    • https://a5a8f6e1-24ae-425c-880d-6f4079e3c376.filesusr.com/ugd/035627_1e441f555dd14ed2b3e08f654b7ee697.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cac69364-5c81-4972-8ee3-eafbb75480f5/comparatif_superlatif_allemand_exception.pdf
    • https://uploads.strikinglycdn.com/files/f695f9d1-07be-44ed-8c39-58803b24037c/rigol_ds1054z_ultrascope_software.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f99d.bin
9d4b4d3815416ac212c11d838d3f9c4d2d5aa05aa40b0ba26d79aff197f4ba28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 5008 bytes
font_01_sfnt_off00010ac8.bin
c7cdcd6740cae6709fec538548dc13e74ed9f1134c28248f66d59e366a538e7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC8 11248 bytes

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