Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26b32510d48897c…

MALICIOUS

PDF

86.1 KB Created: 2021-04-03 00:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6c67366c897c8fc0806046c707a54fd9 SHA-1: c3df1f942f39a6c3be3c43488d316837f5396812 SHA-256: f26b32510d48897cda6421b8bb1c8fe31b9d2e6db9ac61521de57c18c080018b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=neoliberal+education+in+the+philippines+pdf PDF link annotation
    • https://cdn.sqhk.co/xurawupo/jLIDt5o/hot_wheels_race_track_color_shifters.pdfIn PDF document text
    • https://jadamoxor.weebly.com/uploads/1/3/5/3/135344742/popadoluw.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/xoguvukuvekejivilewiguso.pdfIn PDF document text
    • https://cdn.sqhk.co/mudebijutene/jg1hgjh/infantile_hypertrophic_pyloric_stenosis_guidelines.pdfIn PDF document text
    • https://labimatejodo.weebly.com/uploads/1/3/2/3/132302966/rogene.pdfIn PDF document text
    • http://zuzavepojul.mygamesonline.org/present_perfect_already_just_still_yet_exercises.pdfIn PDF document text
    • https://tedamitaza.weebly.com/uploads/1/3/0/7/130740371/1191962.pdfIn PDF document text
    • https://tamipabofoj.weebly.com/uploads/1/3/4/8/134876193/812d5eb8172435a.pdfIn PDF document text
    • https://zoxamadafipezo.weebly.com/uploads/1/3/1/1/131164297/3c6262f0ee6c042.pdfIn PDF document text
    • https://jivekale.weebly.com/uploads/1/3/4/3/134319103/foteguzajed.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/383101112382r4o4.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/igjgEjj/word_family_games_free.pdfIn PDF document text
    • https://rijejoxutozi.weebly.com/uploads/1/3/4/5/134599637/1210626.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/podejun.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/jjhLJii/ant_simulator_3d_full_mod_apk.pdfIn PDF document text
    • http://uscarinsurance.info/my_family_story_book_onlinen40x6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_3066af670ede4fc0a76e93be6b07825a.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_a6172a2add694cc88116bdbd65a8c684.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_013bb15f70d54051bc47b91972a5220d.pdf?index=trueIn PDF document text
    • https://dae57379-2785-4108-a223-4562ecbfc22e.filesusr.com/ugd/87ad98_e5c960051a8a46248e23c77b70a3d673.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CD 5352 bytes
SHA-256: a8df162a081df3002e40c00344d95db661b4668b657111f0b0bdffa402c6a2bc
font_01_sfnt_off000125f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F5 10944 bytes
SHA-256: d335a55774698030c770b9e0f02abd5080eecd4b257b55ed900ee0d746fc9c0e