Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c2df7db312d623…

MALICIOUS

PDF

78.7 KB Created: 2021-04-02 04:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1ea01a2f274190c42dfaeef368486e0 SHA-1: 7dfb334fa77a658d763dadf7aa1c579771a63755 SHA-256: b5c2df7db312d623c15212e895d13f7b53948fb3c24a1a1ae06c31f574985385
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier. It contains a large number of external links, including one pointing to 'lozipotod.ru', suggesting a link farm or phishing attempt. The 'wkhtmltopdf' authoring application and the presence of embedded fonts are noted, but no executable scripts were extracted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-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://lozipotod.ru/award?keyword=radiology+for+anaesthesia+and+intensive+care+pdf
    • https://kigijogi.weebly.com/uploads/1/3/4/7/134702755/7039128.pdf
    • https://vokefepafox.weebly.com/uploads/1/3/4/3/134333292/rilatonej-mesisomixa.pdf
    • https://mefewenitili.weebly.com/uploads/1/3/1/3/131379946/begusobovokixu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gitipelut/phonetic_alphabet_tables.pdf
    • https://s3.amazonaws.com/mesixadelomomo/57680949956.pdf
    • https://s3.amazonaws.com/gurafoga/waduzigewovuzoj.pdf
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_6568c87513e4425a8de0b0939c386a1a.pdf?index=true
    • https://s3.amazonaws.com/muxegeza/lugazavi.pdf
    • https://s3.amazonaws.com/napoledunadigo/pdf_using_blob_javascript.pdf
    • https://s3.amazonaws.com/nijosinizo/jodupomapur.pdf
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_befdfe0650054cac990d42d1e064517c.pdf?index=true
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_dfdb8083c1814841bd79286c726a143a.pdf?index=true
    • https://s3.amazonaws.com/bofake/the_merchant_of_venice_characters_images.pdf
    • https://s3.amazonaws.com/desekusoxi/philips_norelco_bodygroom_series_7100_canada.pdf
    • https://s3.amazonaws.com/mosezavor/67350206578.pdf
    • https://s3.amazonaws.com/bupaxomu/android_studio_change_app_font.pdf
    • https://s3.amazonaws.com/ginutu/free_making_predictions_worksheets_2nd_grade.pdf
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_180f6283c67042949a43934ffaa05e6e.pdf?index=true
    • https://s3.amazonaws.com/mubefula/momejivokarokadowafaf.pdf
    • https://s3.amazonaws.com/turip/whats_new_at_taco_bell.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e790.bin
dea576a99bc0bbd821e7b67df99b8f30444d50b45cc4569ee3507aec585ff72a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE790 5376 bytes
font_01_sfnt_off0000f9e4.bin
294f5e99936d2ec9281ea0778ace024bd4db5d65f0e76d9dd6d9726a27a3c483		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 10760 bytes
font_02_sfnt_off00011eb0.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 4324 bytes

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