Malicious PDF — malware analysis report

Static analysis result for SHA-256 d186eb79a12cc541…

MALICIOUS

PDF

81.2 KB Created: 2021-03-11 20:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07bfb51cee6bc10d6e175dad09918f26 SHA-1: d2785e53db42d255c5cd97515db1b91e4b0bbb19 SHA-256: d186eb79a12cc541270c650c235689bb66d4dd8be0c1056691a79194dc8c8484
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains numerous external links, suggesting a link farm or phishing attempt, with one prominent URL being https://xezojetit.ru/award?keyword=accidente+vascular+cerebral+hemorragico+pdf. The document body appears to be malformed or obfuscated, preventing a clear understanding of its direct content, but the overall structure and heuristic firings strongly suggest a malicious intent 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://xezojetit.ru/award?keyword=accidente+vascular+cerebral+hemorragico+pdf
    • https://cdn.sqhk.co/zewesifadeka/TCgjggo/police_car_drives_into_protesters_new_york.pdf
    • http://pufegusikozig.22web.org/janirelexufo.pdf
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/pafuwarunavelo.pdf
    • https://cdn.sqhk.co/fusozuwalas/dhjBgdC/samsung_email_app_account_settings.pdf
    • https://cdn-cms.f-static.net/uploads/4422150/normal_603202c8c186a.pdf
    • https://cdn.sqhk.co/xibidodoko/jwjamt5/pawumovipepatok.pdf
    • https://static.s123-cdn-static.com/uploads/4449172/normal_5ffd8774c8ed9.pdf
    • http://pumeputokamodo.22web.org/93764871190.pdf
    • https://ruliduwaj.weebly.com/uploads/1/3/4/0/134016670/ba95e4.pdf
    • https://cdn.sqhk.co/kavonalitego/axHhbgj/255898556.pdf
    • https://cdn.sqhk.co/vujenibolo/aukzgjT/fonemeposutatalexewimow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_63cd03abb8db4783a932f5e8c62fca88.pdf?index=true
    • http://konimeva.rf.gd/braggs_apple_cider_vinegar_weight_loss_success_stories.pdf
    • http://pobununebizi.epizy.com/fundamentals_of_calculus.pdf
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_339b49dcc9f6480d89ff6d4f17688c6c.pdf?index=true
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_6e822fcf901447cab3fb18692f3396be.pdf?index=true
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_a9eb2e4855b140a1bc9ee1791abafa2a.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_off000100d9.bin
b2cdcf1e9a5b2deb65343992508849a88bc62b4859addf3ee1d1dd92ef7ddd21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100D9 5756 bytes
font_01_sfnt_off00011448.bin
b2214455bff8c1f5497060cc7193cb37276be4b4e917c24f81bc75100e7a4cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11448 10440 bytes

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