Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4b4e95223db630…

MALICIOUS

PDF

66.7 KB Created: 2021-02-16 01:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c3e9a807258346108e0690c2d4d6862e SHA-1: 5a612bbff79cc75f53d1e03d538ab4d45cb49175 SHA-256: 9d4b4e95223db630106d7ee6e96e75fc90fdd4583ab83ae31c24c441f3b961f0
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://seumenha.ru/123?utm_term=data+structure+and+algorithm+in+c%252B%252B+2nd+solution PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379736/normal_6003235c992c4.pdfIn PDF document text
    • https://cdn.sqhk.co/gowexenopa/3jhT7fE/breadwinner_cafe_nutritional_information.pdfIn PDF document text
    • https://cdn.sqhk.co/muvetowiripa/ihgezge/recorder_of_deeds_cook_county_locations.pdfIn PDF document text
    • http://totalcreditreport.info/confidentiality_agreement_template_freeygrhv.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/bcD6R14/jumpstart_mtg_arena.pdfIn PDF document text
    • https://cdn.sqhk.co/visesefider/j8giHgi/my_mount_nittany_health_enroll_now.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424997/normal_5feb2f90bcc43.pdfIn PDF document text
    • https://tivufotevomok.weebly.com/uploads/1/3/2/6/132682035/87efc8.pdfIn PDF document text
    • https://cdn.sqhk.co/tedisebufen/68LQJgi/standoff_2_hack_download_2020.pdfIn PDF document text
    • https://waripeseditalas.weebly.com/uploads/1/3/4/0/134012866/a6c0dd1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490929/normal_5fee84d249df2.pdfIn PDF document text
    • https://farunekigevizaj.weebly.com/uploads/1/3/5/9/135976182/6173343.pdfIn PDF document text
    • http://silkhfig.bid/jitiwibonubttv.pdfIn PDF document text
    • http://unityfree.xyz/cimatron_e13_full_crackt4h2u.pdfIn PDF document text
    • https://cdn.sqhk.co/noluxokeruma/jdhgjh2/75324207387.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC971 5484 bytes
SHA-256: 523dfc1aa9af06683a061bc8e0ca6b8dc274ac975aa8b4e1a547b448c8b9e7ad
font_01_sfnt_off0000dbef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEF 9808 bytes
SHA-256: e910d91ad23ac5cf82aae8bf370f92e9d0a0fef8b717ac9ffe99596e45960cb9

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