Malicious PDF — malware analysis report

Static analysis result for SHA-256 263d78892d3106f1…

MALICIOUS

PDF

100.7 KB Created: 2020-12-30 15:55:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: aecf342613fa83fd087c29dc2d9be3eb SHA-1: 112bf19af1266a8b6147c617e5dbef3b7b5560b3 SHA-256: 263d78892d3106f166fc620cc204c301f7f3545f408a72dfb0afc21c16e6a52e
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=explorers+of+time+vs+darkness In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fc079ba33383.pdfIn PDF document text
    • https://botiwugagow.weebly.com/uploads/1/3/1/8/131872238/5584299.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/lesepapusojifax/tejenizunotitumirapeb.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/22772907109.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/disable_bixby_button_s9_android_9.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/87273699595.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/mowalonatifefelemezu.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/boxonapegafebotopol.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/kejujifa.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13667 6264 bytes
SHA-256: d1e3d6f91919126c85b803250576fe2478bc9ffcfe3b8e7c93def69e372d33c9
font_01_sfnt_off00014bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFF 5336 bytes
SHA-256: 73fdcb48c9901a9295bd42ebcf244d90dd9b420741d5ff1a74e51bc30a9e7c94
font_02_sfnt_off00015e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1A 11508 bytes
SHA-256: 7f1f68cf86a8cbd8e9a69cddc6804b8ef3a1cc48d8b45c69a6c848ea9141349d

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