Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cfebe8692c680f…

MALICIOUS

PDF

83.2 KB Created: 2021-04-02 13:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30c3eceae4c9810e6d72476767c6fcac SHA-1: e178c6c4912d7cd7d3d3abbbeb24e8ef9df9c1a4 SHA-256: 42cfebe8692c680f09955a410e249d88db0a21f2c8a15c876cdb32b00fa46692
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to unknown or potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=2015+ap+chemistry+multiple+choice+answers+and+explanations
    • http://rezokivi.medianewsonline.com/davawetenepumo.pdf
    • http://detonic-hypertonie.website/bbc_planet_earth_2_worksheetsaxjxq.pdf
    • https://wokopapun.weebly.com/uploads/1/3/5/3/135388848/fovobag.pdf
    • http://nanolenka.xyz/all_american_pressure_canner_941_manualtf48v.pdf
    • https://subegawi.weebly.com/uploads/1/3/5/3/135394411/95569a69196ea.pdf
    • http://atomyimperial.ru/kenmore_heavy_duty_70_series_manualvro58.pdf
    • https://fularoxu.weebly.com/uploads/1/3/1/4/131452806/95d0e4f16b390.pdf
    • https://wugepazi.weebly.com/uploads/1/3/4/3/134348030/kewul.pdf
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/jukosuzitagawubizevu.pdf
    • http://ideal-it.fun/dolores_cannon_convoluted_universehwukg.pdf
    • http://thedopemarketing.com/the_road_pinoy_movie_reviewi3jwx.pdf
    • https://bafexobis.weebly.com/uploads/1/3/4/0/134041027/pazisukos_diduvefaz_golidigesukela_geledevo.pdf
    • http://komaxinatobofe.medianewsonline.com/porifera_sycon.pdf
    • http://ratedewu.scienceontheweb.net/power_pressure_cooker_xl_manual_e3.pdf
    • https://biwireteput.weebly.com/uploads/1/3/4/1/134131636/vananazefafevidebez.pdf
    • https://pixebekisutajud.weebly.com/uploads/1/3/0/7/130775176/9052438.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_cfb89b4b101340a8ba636f416ce3fe39.pdf?index=true
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_a415d2ea92194424b82e97110f2a1455.pdf?index=true
    • https://s3.amazonaws.com/nafamaragisek/fake_text_message_apk_pure.pdf
    • https://s3.amazonaws.com/davawina/kijowovazoj.pdf
    • https://s3.amazonaws.com/megujobemegor/sazinifotivajo.pdf
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_aad276e867ce4c9d9715ac090636e853.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010504.bin
55d574018f5f74b92075a89cd9f9ba73d7face860121aa40938d2a7ee2ff1af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 5928 bytes
font_01_sfnt_off0001192a.bin
2f2afa98e28ca64b49689bbe551eec98b062963a75811adc883ab89784214c1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 11040 bytes

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