Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c92680e6f0612b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 19:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3e85a76ea7206b151d60d459c024108d SHA-1: 5b39a7b16ac58ef0bf1add196f488884f3550ff4 SHA-256: 40c92680e6f0612bc05730813cf86fb22e2b1200ee8baedaa6c247a3bf335c68
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://kuzutuzo.ru/award?keyword=character+study+of+moses+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383471/normal_5fd82a44bfc1d.pdfIn PDF document text
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/noxuraxesuno-lixede-feratar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5fe4d3174f7da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_6018e8ea3a77b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5fc85b4b96033.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367017/normal_5ffb672288531.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/1265582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380699/normal_603445415898e.pdfIn PDF document text
    • https://zaxavafu.weebly.com/uploads/1/3/4/3/134323176/bureza.pdfIn PDF document text
    • https://lekozeva.weebly.com/uploads/1/3/5/9/135964777/zumiwomezofiraneda.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/nuruvapozixix/35794256801.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_c97f0e9543344208ab198c3291a23cf4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/can_you_calibrate_a_taylor_scale.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/fonux.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/zezelozumamenazizede.pdfIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_fb4de7781267424cb5e017e4e48b4155.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/bodeans_soho_menu.pdfIn PDF document text
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_fc582d3ea44942d9873cfe2c36d15294.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_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 5368 bytes
SHA-256: 5c8cd5d9f72f13b9ecff4b6bc689f7d9b016f7fe73b815f8af2eb5195d251121
font_01_sfnt_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 10824 bytes
SHA-256: e535467ad7cc779135d67705eba5bcc3bf6ec3587a7a78971eefb874c2042ad6

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