Malicious PDF — malware analysis report

Static analysis result for SHA-256 956d080f26483048…

MALICIOUS

PDF

74.2 KB Created: 2021-03-14 16:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9f428dcd78b5fc9e8f341c0a2d7acfc6 SHA-1: ba9862caa91ce8d27920ec158923c30de0c92283 SHA-256: 956d080f264830481125ed19b933f77ed12669a7556a1af4792ef3a397dfd4ae
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to trick users into visiting compromised or malicious websites.

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/strik?utm_term=how+to+use+classes+in+python+3 PDF link annotation
    • http://igafnd.org/camerafi_live_mod_apkw96yc.pdfIn PDF document text
    • http://fesufobototezer.mywebcommunity.org/textbook_of_biochemistry_for_medical_students_free_download.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/basic_english_grammar_book_1.pdfIn PDF document text
    • http://womenit.space/puwekumefijatrgo.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/what_are_structured_credit_products.pdfIn PDF document text
    • http://verifybadgesbusiness.com/irregular_verbs_simple_past_exercise02kms.pdfIn PDF document text
    • http://familyit.pro/test_data_management_jobs_in_punelq82y.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/what_indian_food_has_the_least_calories.pdfIn PDF document text
    • http://phulop.store/delco_remy_50dn_alternator_parts_manualk9b6w.pdfIn PDF document text
    • http://worldthailand.fun/vizawevoxisiee6fl.pdfIn PDF document text
    • http://blu-ital.space/95777613581g4wpt.pdfIn PDF document text
    • http://erkutungotu.com/40730951508q2gzv.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/65207261300.pdfIn PDF document text
    • http://kajuzumanaz.sportsontheweb.net/space_food_nasa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_2c50efd0f72e49089b632b5ad5ed2acf.pdf?index=trueIn PDF document text
    • http://lurolubudoruk.onlinewebshop.net/88057180511.pdfIn PDF document text
    • http://kopolug.myartsonline.com/homedics_personal_portable_ultrasonic_cool_mist_humidifier_reviews.pdfIn PDF document text
    • http://sijadogif.atwebpages.com/giwegavinafokenixifuji.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_9f8478ea99f74d2a86f7886958f888d1.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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 5244 bytes
SHA-256: 757fbb0a3aff7b3c472832a4e5d08c5d7cfaf667cf3b5b4e7d47658bff93f78f
font_01_sfnt_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 10816 bytes
SHA-256: 97dedf7d4fa0f86bb04dcba31cfd2bd13318bcde937625bfb48466038fe3ee18

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