Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf09071dbfd84b4…

MALICIOUS

PDF

76.9 KB Created: 2021-02-27 03:25:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 76db32292efde2af3e8f8b2698f8d532 SHA-1: 82c6a320e107517f8d6b662f4f616ede4680806e SHA-256: 8cf09071dbfd84b405049964c69f61995aeadd7ec9d822ef2581ad55c5d7fd3c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=jimmy+cross+and+martha PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465149/normal_60340cee4d928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_600e6668866c7.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/dobiwefase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476750/normal_60025841b72f3.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/amy_tan_mother_tongue_rhetorical_analysis_essay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5fca28768246e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5fedbf7734e33.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/kimeja.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/joZjf8z/33069781034.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/what_is_the_definition_of_the_word_quran.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://muvelexadaw.epizy.com/pokemon_black_and_white_game_gba.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/98187464074.pdfIn PDF document text
    • http://pabizazixivak.epizy.com/aliens_colonial_marines_ps3.pdfIn PDF document text
    • http://bezegorev.epizy.com/44881893869.pdfIn PDF document text
    • http://jemileti.atwebpages.com/8866325441.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 4908 bytes
SHA-256: 0bd3c357d7972aee7675348d1525efe05ff950be927068e27b26aa900622a754
font_01_sfnt_off0000f58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58A 10276 bytes
SHA-256: a3a49b6d224ca4e78ec67f9bcab0d975caebc0fda9494f6f56de517075d7f85b
font_02_sfnt_off000118ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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