Malicious PDF — malware analysis report

Static analysis result for SHA-256 c770c09a15257698…

MALICIOUS

PDF

65.6 KB Created: 2021-02-27 11:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: c4390f6cd2d812564a50b5157b23bc49 SHA-1: 37ab07a01668c821b63525d55d2c88aac55adf6b SHA-256: c770c09a15257698ce2a99e8b9f36efdfec142a9d492d266ff3ec4582cf8d518
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://crophysi.ru/strik?utm_term=york+diamond+80+furnace+pilot+light PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478951/normal_5ff92b7151693.pdfIn PDF document text
    • https://sonunupenoxomo.weebly.com/uploads/1/3/3/9/133986361/puvubo.pdfIn PDF document text
    • http://eslivdrug.space/98934796437p87u3.pdfIn PDF document text
    • http://crubr.space/yeezy_supply_shoe_size_guide3tb4k.pdfIn PDF document text
    • https://luvisumor.weebly.com/uploads/1/3/5/3/135390586/fiminogijobo.pdfIn PDF document text
    • https://jasasexu.weebly.com/uploads/1/3/1/1/131163864/2993582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490953/normal_60136c55d9989.pdfIn PDF document text
    • https://rafutukeri.weebly.com/uploads/1/3/1/4/131453201/3833816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448551/normal_5fd1edf85a551.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369505/normal_5fc9a9536c04d.pdfIn PDF document text
    • http://ottics.ru/90341059896577yw.pdfIn PDF document text
    • https://foxidaxoluw.weebly.com/uploads/1/3/4/0/134016742/2aae4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000b7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E0 5636 bytes
SHA-256: e58bca973ba3c5aaa1a2163b62f29caf70c91743df311a019e980ae722bf4059
font_01_sfnt_off0000cad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD2 9552 bytes
SHA-256: 9769056038962d3901dc7550504b6854c7fc62fd00a2f79115f68aab6437cb54
font_02_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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