Malicious PDF — malware analysis report

Static analysis result for SHA-256 df408c2cbace81c9…

MALICIOUS

PDF

83.2 KB Created: 2021-03-20 20:58:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2096f7b5f4322e24ff20de2bc9111161 SHA-1: 1b62ff7ca6f749adfeefc41f1a2fee3b05f9e3ab SHA-256: df408c2cbace81c9822ba8346c552b35d0e57b005143c21f141389692f36821b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, which are indicative of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://xezojetit.ru/wix?keyword=supersu+zip+apk+free+download
    • http://vasakuso.sportsontheweb.net/94340140245.pdf
    • https://galekogikelubem.weebly.com/uploads/1/3/1/4/131438025/wagexenasopal_wulusurifinavuk_lipabunapamepoj.pdf
    • http://twirlini.com/13175839636ad4vo.pdf
    • http://kevebofuru.medianewsonline.com/assessment_tools_for_special_education_students.pdf
    • http://info-pages.ru/buxamebovog55kf.pdf
    • http://lifeit.pro/punctuation_guideh79e0.pdf
    • https://bolamowoxuwev.weebly.com/uploads/1/3/3/9/133997192/5156448.pdf
    • https://cdn-cms.f-static.net/uploads/4483604/normal_6043b93b71a77.pdf
    • https://static.s123-cdn-static.com/uploads/4455370/normal_5ff68bf53b15d.pdf
    • http://yourcy.com/la_casa_de_los_espiritus_personaje_principal5wxdy.pdf
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/7899b6b5c9eecd1.pdf
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/jukurizisopo_zovizu.pdf
    • http://gmetry.online/90653390145g44zg.pdf
    • http://bisibometixo.mywebcommunity.org/61192217549.pdf
    • http://seweripuwas.mywebcommunity.org/21274530577.pdf
    • http://sezejawi.mypressonline.com/xuxulojelifu.pdf
    • https://sogovowezop.weebly.com/uploads/1/3/4/3/134324678/0ed5fe7bf8ad53.pdf
    • https://cdn-cms.f-static.net/uploads/4466673/normal_60277d3ab5975.pdf
    • http://pojibuvuj.mygamesonline.org/pibezute.pdf
    • https://kidenido.weebly.com/uploads/1/3/1/6/131636891/a658fcb7.pdf
    • http://matemepujibad.scienceontheweb.net/judul_skripsi_akuntansi_biaya.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wareguw.atwebpages.com/poxiniserile.pdf
    • http://wokidomogu.onlinewebshop.net/bravely_default_guide.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_off0000fff9.bin
29401ab481547ad1f754bf65fe51110d5db2e1787ddc103d83f47ad50bd477a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF9 5344 bytes
font_01_sfnt_off00011253.bin
80dfe913993df63006c041f87156f9fdcea15e176bbfa4d67754ff04eb19b4c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 13968 bytes

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