Malicious PDF — malware analysis report

Static analysis result for SHA-256 79b4a06858fb3af4…

MALICIOUS

PDF

76.6 KB Created: 2021-03-14 08:46:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2a2b9f76736dfbda7913b8f0065c19cd SHA-1: 2eca17445bc65fb3f521380b4318c0cee17ad386 SHA-256: 79b4a06858fb3af4b83639a0fed4d50322390c3acd2806f2dc9db42bad293c15
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily corrupted, contains metadata related to PDF generation, and the presence of external URIs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/strik?utm_term=how+to+draft+letter+of+intent PDF link annotation
    • https://cdn.sqhk.co/zerurukoraju/lhgifij/twisted_metal_ps4_trailer.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/conflict_resolution_worksheets_for_middle_school.pdfIn PDF document text
    • http://tipografiyav.moscow/fovamazatex82tr1.pdfIn PDF document text
    • http://thefortykuti.com/35036108712y26bv.pdfIn PDF document text
    • http://strapslap.online/421953508291ujgu.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/qgi2whh/13229679163.pdfIn PDF document text
    • http://servisvds.ru/free_printable_family_tree_template_7_generationsahn1y.pdfIn PDF document text
    • http://zerkalo-fugicar.website/fitbit_versa_3_bands_interchangeable9v9z5.pdfIn PDF document text
    • https://cdn.sqhk.co/bexuxoxabim/ibhcMif/litifakusuweteb.pdfIn PDF document text
    • https://guxesawaxogego.weebly.com/uploads/1/3/4/3/134314991/050d744d85f7f1.pdfIn PDF document text
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/2395974.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/briggs_and_stratton_power_washer_1800_psi.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/ZDhcjj1/offline_os_maps_android.pdfIn PDF document text
    • https://wutodifutatur.weebly.com/uploads/1/3/2/8/132814097/8f4b9f.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/are_cabelas_dehydrator_trays_dishwasher_safe.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/commerce_dictionary_english_to_marathi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://roporuti.onlinewebshop.net/computer_course_download.pdfIn PDF document text
    • http://finuzajobozosom.epizy.com/69784953489.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/rapibovowoxu.pdfIn PDF document text
    • http://fujimuwudoketiw.rf.gd/maths_aptitude_questions_with_solutions.pdfIn PDF document text
    • http://refusunono.onlinewebshop.net/ridoxamutuxomedasefo.pdfIn PDF document text
    • http://mokupimi.epizy.com/how_much_is_a_golf_cart_worth.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 4776 bytes
SHA-256: a6460b662b4ad0e1d92fd6cfc61cdb98f2078e87eb720955855de7bb6234e9a7
font_01_sfnt_off0000fed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED5 11212 bytes
SHA-256: 3396024e568119a351064f1607fcd642de42b798bdd2e9cbd3fd1240f3cfe74d

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