Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd14f9c29071267e…

MALICIOUS

PDF

83.4 KB Created: 2021-04-10 15:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3fc9725a6319dcfa59d0a165812ee654 SHA-1: bee584901b663b194ef041f360a30ff731e42b08 SHA-256: dd14f9c29071267ec725bd3bf438e070eb59a390af58f2bf5afa577a0b458370
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 domains, suggesting a link farm designed to redirect users to malicious content. The primary malicious URL identified is https://baarspo.ru/strik, which is likely used to deliver a secondary payload or redirect to a phishing page.

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://baarspo.ru/strik?utm_term=when+is+wings+of+fire+graphic+novel+5+coming+out PDF link annotation
    • http://fridgeservice.ru/i_draw_color_by_number_pixel_art_appdmvr4.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/ainsi_parlait_zarathoustra.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484636/normal_6034611d9cf61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391915/normal_5fc6e018b9972.pdfIn PDF document text
    • http://retoxen.mypressonline.com/bnf_68_free_download.pdfIn PDF document text
    • http://nipodek.22web.org/mathematical_analysis_2_canuto_tabacco.pdfIn PDF document text
    • http://trikolor.site/article_analysis_example_apa_formatfqmtq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486344/normal_606bf89cbde78.pdfIn PDF document text
    • http://tadugebakonuged.getenjoyment.net/gufajuperazovupite.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/inverse_discrete_wavelet_transform.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496571/normal_605efebc7b338.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/support_vector_machine_matlab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fba3c7a7-0c0e-4670-9474-46957840419d/88271233503.pdfIn PDF document text
    • http://teposekif.epizy.com/refexonuwowu.pdfIn PDF document text
    • http://telagivepovadul.epizy.com/rpg_ambient_sounds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bf07dc2-9bea-4e05-a668-b32b41d9119f/687150086.pdfIn PDF document text
    • http://wozadubokurego.epizy.com/fidic_contracts_guide.pdfIn PDF document text
    • http://matiwusaned.rf.gd/zepapororedidikaro.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_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 5716 bytes
SHA-256: cae1fc9dd793372e72e4a5979795143a290c211e9b5561a5763b26f8cb60343d
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 11272 bytes
SHA-256: f9d2c4cec1a11cc02e1c557dd015274acdf7dc096872a8d96570a04934239b2c
font_02_sfnt_off000129e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 16392 bytes
SHA-256: 1a2cef344135cdcc96c5e1f54e34dedc508871894fe74269a84f378fcf36fd5f

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