Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f87419aae481c4…

MALICIOUS

PDF

80.7 KB Created: 2021-05-25 14:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 16323219437f2c224177c4fe4e34251a SHA-1: 41da6014b7d759d702d77ee4f01fe1f6fa55f37f SHA-256: 84f87419aae481c481b7c5cf7fe6b612222c1581b1ff3a0ef3e3f3dbe2337ee9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, appears to be a lure related to 'sociology notes upsc', aiming to trick users into clicking the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/strik?utm_term=upendra+sir+sociology+notes+upsc PDF link annotation
    • https://wulaludotesi.weebly.com/uploads/1/3/0/9/130969185/4989627b1ecee4c.pdfIn PDF document text
    • https://mubuzetuwifo.weebly.com/uploads/1/3/4/7/134703000/596277e2d4.pdfIn PDF document text
    • https://topuzuxet.weebly.com/uploads/1/3/0/7/130739133/vufowujiwerakafibeze.pdfIn PDF document text
    • https://jabelobiwisaga.weebly.com/uploads/1/3/1/6/131636903/6cd4600c8a7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481990/normal_60391569aae67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_602fbb28f18ab.pdfIn PDF document text
    • https://seruvexude.weebly.com/uploads/1/3/4/4/134404645/c231e3717.pdfIn PDF document text
    • https://mefutegisudaxat.weebly.com/uploads/1/3/4/3/134350432/028f91d45fe7c.pdfIn PDF document text
    • https://zoriliwusitilo.weebly.com/uploads/1/3/4/4/134479822/rodemuxavex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501991/normal_5fddf8dcef17d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_6026b9f638fbb.pdfIn PDF document text
    • https://sezulozag.weebly.com/uploads/1/3/0/9/130969806/podago_gawogez_wedegevivofi_xatikinawudune.pdfIn PDF document text
    • https://vafomelopujoxo.weebly.com/uploads/1/3/4/8/134864043/fuferezoxudidob-bukog-tumimobokofe.pdfIn PDF document text
    • https://xosofanukofupa.weebly.com/uploads/1/3/4/8/134879033/sadonikojego.pdfIn PDF document text
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/maneta-zojuwuwodap-vazugub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471481/normal_6020ff9ad68b8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421354/normal_5fce690bba518.pdfIn PDF document text
    • https://muzunamarufo.weebly.com/uploads/1/3/4/4/134463020/2145844.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/allen_bradley_rslogix_5000_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/how_to_install_mods_crusader_kings_2_steam.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/apa_style_6th_edition_table_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/46889571717.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/xinufilakog.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 5332 bytes
SHA-256: c00680b90c98fa2382544246a0a336fe17e14780091eaacde3f91c0e0ff9eec4
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 11032 bytes
SHA-256: e64711c97cadfe94561e4b8c72ca5620088ca5794ee53a4f5131758254ba5ea2
font_02_sfnt_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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