Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00ff615a42a3e8f…

MALICIOUS

PDF

76.4 KB Created: 2021-03-12 19:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2520052f218163697fe79a16151eec7c SHA-1: b1e6e36e11fe29a2777484931f9759ff278bf587 SHA-256: b00ff615a42a3e8f2e8322fe082d8bb23bc347d6efa77adeb48d82c338f6dd51
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and redirectors, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://yafferge.ru/123?utm_term=colorectal+cancer+screening+guidelines+nz', are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=colorectal+cancer+screening+guidelines+nz In PDF document text
    • https://cdn.sqhk.co/zotofoza/icUidXy/vumezovogegujirukodi.pdfIn PDF document text
    • http://bettermoneytips.com/cido_sulfuroso_formula_quimica95okc.pdfIn PDF document text
    • http://tubujefowabe.medianewsonline.com/zufuzubojitaj.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/QocSCje/oneplus_recent_button_not_working.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/infecciones_alimentarias.pdfIn PDF document text
    • https://cdn.sqhk.co/nulegudup/0hd0hc9/sinimivu.pdfIn PDF document text
    • http://avto-trokot.xyz/48088349191vjz55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_6028fb0f61775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450140/normal_5ff0944acc1a3.pdfIn PDF document text
    • http://biwumani.mywebcommunity.org/best_traditional_african_music.pdfIn PDF document text
    • http://makeyourself.xyz/tegodogejkope.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_03ce3c04b4fb4e58bdcab82ae93d48a0.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_08879c23449d4060afe3b3a4ff2f8c06.pdf?index=trueIn PDF document text
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_2e7bfc1686e144489eba2a8474377a70.pdf?index=trueIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_917f476357cc4eb3b1086f967c9a085f.pdf?index=trueIn PDF document text
    • http://wojibikifi.myartsonline.com/40995512468.pdfIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_8de270b447e24e31b69893dfd641fd2b.pdf?index=trueIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_feda0cfb3ca7484b8d9e7480ecb23b15.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_off0000ec77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC77 5060 bytes
SHA-256: c1d5b8e1fe8038d3f43d967f8e45c433d845733e4cea253abdabc981e975def5
font_01_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 11692 bytes
SHA-256: 2506f2edb47fcb6eff59cc4dacc97cf2bc74a42393718595fbadf35437b4cece

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