Malicious PDF — malware analysis report

Static analysis result for SHA-256 657c429af2b3332d…

MALICIOUS

PDF

68.7 KB Created: 2021-02-02 05:34:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b2617108378d396dfcf6fe7a111b559b SHA-1: c7e16ded869965b0f1ba3a552b2bc8dd451c72c6 SHA-256: 657c429af2b3332d27f8be9f552b51054db0daf9a39240c29af1908dbbee265b
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/aws?utm_term=classifying+real+numbers+activity+pdf PDF link annotation
    • https://pafajawu.weebly.com/uploads/1/3/2/6/132682051/f3e6f873e.pdfIn PDF document text
    • http://grigolia-studio.ru/7464182631r0nez.pdfIn PDF document text
    • https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/943618.pdfIn PDF document text
    • http://podipotekoi.ru/die_together_lyrics_pliesfsj3t.pdfIn PDF document text
    • http://gifozuxozud.22web.org/box_office_report_of_malayalam_movies_2018.pdfIn PDF document text
    • https://rudotuvesil.weebly.com/uploads/1/3/5/3/135398110/devajuzetuso.pdfIn PDF document text
    • http://ukranews.site/seminar_report_on_biometrics_technologyb6qg4.pdfIn PDF document text
    • https://linekepev.weebly.com/uploads/1/3/4/0/134041162/facfc2399.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/kovozenamofox/tosuxowepilavamuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/bootable_pen_drive_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/aadhaar_enrolment_correction_form.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/possessive_adjectives_explanation.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/46599243459.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/falunusoluxonarobitadexeb.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/68950677084.pdfIn PDF document text
    • http://povovudajax.rf.gd/21953065243.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/fugifoxizatigewezeli.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/emulador_bematech_mp_4200_th.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/bluestacks_failed_to_install_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/capital_balance_sheet.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_off0000cc2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2A 5684 bytes
SHA-256: ab6f8784d395b0f80d8a97aa081a2dd9f9ccd470faec5bc51d1cd1f1961976a6
font_01_sfnt_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 11264 bytes
SHA-256: 3d89feeca20657cedcdbe87561355adee9ac53317f5900e0a27de38a0f97c30c

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