Malicious PDF — malware analysis report

Static analysis result for SHA-256 78003e54875397a2…

MALICIOUS

PDF

96.0 KB Created: 2021-05-13 23:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ead195b384ca56bc3923789a5f6943cb SHA-1: 2b7d648a1243f7b3d9e660ad58eaf0535d32828b SHA-256: 78003e54875397a23965e13a351d0f6e401874286ad1eed50bbb8e606fe7c7cb
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 of which point to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/strik?utm_term=running+with+the+firm+book+review
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/kojirapetotap.pdf
    • http://maxovulosaxa.22web.org/mariam_khan_reporting_title_song.pdf
    • https://static.s123-cdn-static.com/uploads/4446645/normal_600249517e03c.pdf
    • https://cdn.sqhk.co/kivipemo/Dvidgjl/android_nougat_32_bit.pdf
    • https://fisuvinu.weebly.com/uploads/1/3/4/4/134497747/a9cfb78.pdf
    • https://static.s123-cdn-static.com/uploads/4403804/normal_5fcef7efed835.pdf
    • https://cdn-cms.f-static.net/uploads/4453332/normal_606e94c662252.pdf
    • https://cdn-cms.f-static.net/uploads/4369643/normal_602ee6781dcfe.pdf
    • https://cdn.sqhk.co/rojisixel/ihahfK1/bagamejibam.pdf
    • https://cdn-cms.f-static.net/uploads/4450511/normal_6038fb9bca1e4.pdf
    • https://cdn.sqhk.co/letarezetap/CKsihKb/40504930244.pdf
    • https://simisasokudu.weebly.com/uploads/1/3/4/2/134235492/selovopevapetumi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vusufof.epizy.com/zafejul.pdf
    • http://fubojubuzamug.rf.gd/interview_questions_on_sql_queries_with_answers.pdf
    • http://mabagojovas.epizy.com/90853955106.pdf
    • https://s3.amazonaws.com/xakusineba/adventure_of_jojo_bengali_full_movie.pdf
    • http://pimorem.epizy.com/category_theory_textbook.pdf
    • https://s3.amazonaws.com/luborinizu/gefuberamazuxowole.pdf
    • http://jajebosuwikax.rf.gd/avery_business_card_template.pdf
    • http://faxunarin.epizy.com/66536064951.pdf
    • https://s3.amazonaws.com/sixenogafopoj/virgin_atlantic_airways_email_format.pdf
    • https://s3.amazonaws.com/dubiditiginowo/pokemon_x_y_game_for_android.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_off00013a04.bin
7a959ab21bbbac0247480e8bb2f3c530924e2395059bd7d2638aa3ac950b915c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A04 5124 bytes
font_01_sfnt_off00014b70.bin
25ca92a41c003f4f2c909b0361678a2d1d650f698d9a320506a218754e92b87d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B70 11556 bytes

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