Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e10dbf77ebe417…

MALICIOUS

PDF

68.0 KB Created: 2021-02-16 02:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b47382b69be20e1f9e6d4b392566f4e1 SHA-1: be898e3b21260a9dfcf77e20f732c188cae4cb23 SHA-256: 43e10dbf77ebe4175748515cd137f821cdffdd4afcb70ffcfa0b42d7e7cb2c8d
156 Risk Score

Malware Insights

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

The PDF contains a heuristic indicating it is part of a link farm, with one URL pointing to a site that appears to be a lure for 'intel manual volume 1'. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

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 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://leonvi.ru/wix?keyword=intel+manual+volume+1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479441/normal_5fe7070d5c1a1.pdfIn PDF document text
    • https://cdn.sqhk.co/judawube/cBHhhbm/wheels_on_bus_song_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_600fe32e3eb0d.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/fiSYqhc/27636820205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420747/normal_5fcba554990ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_5fe703624295c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5fe697b5e302a.pdfIn PDF document text
    • https://pazisurezufil.weebly.com/uploads/1/3/4/5/134594691/add299c82e61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491925/normal_6004814bc9301.pdfIn PDF document text
    • https://likimipezerejo.weebly.com/uploads/1/3/2/6/132682052/miximabepavonejol.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/jdgfUik/fafosozoruzomimovoxava.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/Jhdhgih/fitbit_charge_2_won_t_sync.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5fd6392744298.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/wupiwupiwot/kadotipowowujasakoneluzop.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/distinctly_home_egyptian_cotton_sheet_set.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/b2b_branding_strategies.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/target_fieldcrest_twin_xl_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/43552068174.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/tuzasozi.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/mutixamazasobuxizowofo.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/temaluno.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/marbury_vs_madison_simple_summary.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_off0000d1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AC 4604 bytes
SHA-256: 074778aa05ce046da300d4d95ecf52fc180573f0e8799c776273dea2999eb7cb
font_01_sfnt_off0000e149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE149 9728 bytes
SHA-256: c23638f4caab80b24682d1ebbda5e0055b56641701fa20fc4015c86f7ddf415a

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