Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d75c473a3f910c…

MALICIOUS

PDF

75.8 KB Created: 2021-03-30 16:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ad5d569f83c7bd1ae4ceea2c921e089f SHA-1: 365f4d2aefbee5f95a6c69eda3fcc07a63b3a38c SHA-256: 86d75c473a3f910cc03ccf3d148434cb3a4c0ac057b776836bb8e2514769017a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://gimoguvi.ru/award?keyword=presion+de+cavidades+cardiacas+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501214/normal_600952369fa96.pdfIn PDF document text
    • https://cdn.sqhk.co/givesaxi/c0oNRh3/dual_screen_desktop_mount.pdfIn PDF document text
    • https://cdn.sqhk.co/raratajuxu/o5tieGF/74951737084.pdfIn PDF document text
    • http://balifruit.com/95609055220njm5a.pdfIn PDF document text
    • http://kmikaerfs.ru/how_to_write_interesting_character_arcsfe67a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495536/normal_6008b3b7352f7.pdfIn PDF document text
    • http://xupokaxe.medianewsonline.com/vifazilonixuxifofejosazes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425514/normal_5ff78039629d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_604c99bbcb711.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455642/normal_5ff9646d6ff23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_602a55705b547.pdfIn PDF document text
    • http://homearfes.com/sony_str-dh750_bluetooth_setup4d5yg.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/diagnostico_de_salud_concepto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_7a43a8c6b36546e89880b79f50ae3a09.pdf?index=trueIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_b326830140594be398958dc1e1a03751.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_b8c8b7cdb1d8487a998b35dda67bd0bb.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_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 5180 bytes
SHA-256: 1267bbac0182b7cba4eb68ff0e349a485d10ebf8f78f86e99f23f132f20ff253
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 11716 bytes
SHA-256: 9712738a9cb7fc6bb5668bff8b8c483900dc42948819b3e8e1d0573eecd11ee8

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