Malicious PDF — malware analysis report

Static analysis result for SHA-256 392b5b9797d0eeb2…

MALICIOUS

PDF

80.7 KB Created: 2021-03-22 13:15:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bfc26263940d31fa8d6ee46b9526dae1 SHA-1: f31db527760b0bea0e71a428a225f98aa8bbabf2 SHA-256: 392b5b9797d0eeb2d177bd23c23342da469d8adbb90e41aaa2490f502bae0f03
156 Risk Score

Malware Insights

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

The PDF is flagged as malicious by ML classifiers and ClamAV, and contains a heuristic indicating a large number of external PDF links, suggesting a link farm or a distribution point for further malicious content. While no scripts were directly extracted, the PDF structure and external links point towards a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/award?keyword=astrophotography+tutorial+pdf PDF link annotation
    • https://vebogeperudibot.weebly.com/uploads/1/3/1/4/131455328/2266632.pdfIn PDF document text
    • http://jerugujekema.getenjoyment.net/bsc_it_syllabus_mumbai_university_2020_18.pdfIn PDF document text
    • https://marikikugawu.weebly.com/uploads/1/3/5/3/135326377/259d2e.pdfIn PDF document text
    • http://lugodapamaj.mygamesonline.org/duwim.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/limewawixebivi.pdfIn PDF document text
    • http://parovosi.mygamesonline.org/the_millers_prologue_and_tale_translation.pdfIn PDF document text
    • https://mitafewojoruwe.weebly.com/uploads/1/3/1/3/131381680/nakabubaje.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/xufujofaleki/miriposigenesapufesibar.pdfIn PDF document text
    • http://domebiwek.myartsonline.com/vexudowezutetipezetunimiv.pdfIn PDF document text
    • http://xasagode.myartsonline.com/32526923191.pdfIn PDF document text
    • http://bebojivim.myartsonline.com/what_are_traditional_values.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/american_journey_salmon__sweet_potato_dry_dog_food.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/gemapi.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/biblia_tysiclecia_pobierz.pdfIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_2c6e0907f12f4d64be3ce1e973a1a275.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_e8a82534610348bfb1d82865949f17b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/ejemplos_de_reacciones_de_combustion_con_formula.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/11139207765.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/93842801122.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_270ef558a10d4babbf395a8f17e714f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/a_court_of_mist_and_fury_free_download.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_80fabf33db444b69a27420e0377055f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/panokojol/colder_weather_piano_sheet_music_free.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_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 5396 bytes
SHA-256: 169606f4dd964fa217a8e12472bb102f46ce3560f2f4ae607dd73a2b1e1d1a01
font_01_sfnt_off00011050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11050 10984 bytes
SHA-256: b3aa427c28adb9f0f561fd5a8eba630886f13d0ad14cb70bc74ac10e89592c36

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