Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac667788561be63…

MALICIOUS

PDF

78.7 KB Created: 2021-03-22 06:08:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fc5db9621fe03af91f612d3ed050fb49 SHA-1: ef9648f3c455959b791427b20c5977b9d8b6eb19 SHA-256: 1ac667788561be63635c69625f65bb8687ad9f2fcdb5140e6796f9d867d3f354
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating phishing and trojan characteristics. An external URI pointing to 'jacksth.ru' was extracted, suggesting a redirection to a malicious site. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are common in phishing lures designed to trick users into visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=chamma+chamma+video+song++bestwap.+life PDF link annotation
    • http://d2-club.ru/nigijepikomedilibupob1m4is.pdfIn PDF document text
    • http://egosikenclub.com/down_to_the_river_ukulele_chords2yozj.pdfIn PDF document text
    • http://tedewirivotu.iblogger.org/screen_brightness_control_for_windows_8.pdfIn PDF document text
    • http://hookup755.fun/how_to_start_catfish_farming_in_nigeria2unzn.pdfIn PDF document text
    • http://bexibuvisez.iblogger.org/cambridge_yle_placement_test.pdfIn PDF document text
    • http://doorstepcomputers.com/assassin_s_creed_rogue_ps3_freewt5ik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/drug_metabolism_and_pharmacokinetics_quick_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/phyllo_pastry_sheets_woolworths.pdfIn PDF document text
    • http://bezalilanele.rf.gd/probability_and_stochastic_processes_quiz_solutions.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_4610374632c942e9a9dc97d9d7f050d2.pdf?index=trueIn PDF document text
    • http://futotodogedujox.epizy.com/niwobivedinotalaninu.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/nugowodonixifosumu.pdfIn PDF document text
    • https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_ae19bd45c63f4c2aa64431d5cb117471.pdf?index=trueIn PDF document text
    • http://zujazeku.epizy.com/flip_flop_jk_7474_datasheet.pdfIn PDF document text
    • http://lekinip.epizy.com/lufagaseja.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_a8743e9f2f734ca8aa91392a568b4276.pdf?index=trueIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_5096c1cf394b40dfa53cfb7afea4b869.pdf?index=trueIn PDF document text
    • http://wazokikenida.rf.gd/agreement_between_subject_and_verb.pdfIn PDF document text
    • http://tibimixokafif.epizy.com/24573374642.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/durable_power_of_attorney_form_arizona.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_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 5700 bytes
SHA-256: c10d00b98fdb2192a71786932381e704dbdfbd743b4cc9bd6370da16e3729785
font_01_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 11816 bytes
SHA-256: b358555c9caec69c8da2eb0fe65c1f2e03ad6466f35fc13407fc112ea92bbb21

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