Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ed59717d466b86…

MALICIOUS

PDF

68.0 KB Created: 2021-04-06 20:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 37fa0ea5f085682081ba9b0517cc2704 SHA-1: 066a4b0fe50c413470159bcb8a783b5fffea9e75 SHA-256: 91ed59717d466b863513d4b99d4551d78b8716261cb824fed84c286a1dbb7b97
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to 30 external PDFs. The primary URL, https://kuzutuzo.ru/wix?keyword=biology+test+review+answers, suggests a lure to disguise the malicious intent. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a phishing or trojan distribution attempt.

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://kuzutuzo.ru/wix?keyword=biology+test+review+answers PDF link annotation
    • https://cdn.sqhk.co/wegifopi/ajT6pif/83191454573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_602b64209a60f.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/2jgW2ia/how_do_you_teach_a_child_with_adhd.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/h7hdic0/pimonunop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387031/normal_5fffde08dbbb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5fe8347b1e18c.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/fedojigudaj/2x2_formal_attire_template_female_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/norepedesefafutas.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/sleep_hypnosis_guided_imagery.pdfIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_4f7cc945d34644b8b3775799dbe0898c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/booker_t_washington_facts_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8659a9a7-1e5d-4da7-b503-215e48d64d70/il_ritratto_di_dorian_gray_citazioni.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/roduvexolaniwexifo.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/tadamuwigufatozezozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd678839-c04f-4788-b018-b18c5e0ad453/what_is_the_book_after_we_collided_about.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/un_sustainability_reporting_framework.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/41533311966.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_b6efbd8aa40d4c859f76deb6f27c8e36.pdf?index=trueIn 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_off0000cf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF33 5156 bytes
SHA-256: 2dabfa8eb48af78993c62bb3b23e9a19b440758d471f81c9cdac716a0e6c9a35
font_01_sfnt_off0000e0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EC 9828 bytes
SHA-256: 32418cd1a7794c0ab8e77a23943d5ff760ac7ee85d6ce3248adf120d6747a52e

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