Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfc9db9562433a0…

MALICIOUS

PDF

78.3 KB Created: 2021-03-26 13:50:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b5beae56b454392e4242867085d5f3c SHA-1: 7fbc21fb83c8dbc0b7531ae8353c75643aef9790 SHA-256: 9dfc9db9562433a059f3cb741a824815318678f9ea228ea58c5b8c0aac1c0931
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or spam campaign. It contains a large number of external links pointing to various domains, many of which appear to be disposable or associated with link farms. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://maypoin.ru/wix?keyword=sitting+bull+academy
    • http://marketeuro.pro/1293702730tl0tn.pdf
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/9884726.pdf
    • https://static.s123-cdn-static.com/uploads/4388619/normal_5ffc4810dab04.pdf
    • https://cdn-cms.f-static.net/uploads/4448346/normal_60141f50b3058.pdf
    • http://effektzhizni.ru/901127001065k2q3.pdf
    • https://cdn.sqhk.co/jezaziritav/FKugeji/gixavexojumapulugumodo.pdf
    • https://vukosigubew.weebly.com/uploads/1/3/4/8/134860762/687d7ae.pdf
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/wogapifajipesajabaw.pdf
    • https://cdn.sqhk.co/zovaratigu/jgiwbxn/vepigawitoduwubitujax.pdf
    • https://xebololu.weebly.com/uploads/1/3/4/3/134340913/99f9152.pdf
    • https://cdn-cms.f-static.net/uploads/4464314/normal_6030684b93744.pdf
    • https://guduzuzej.weebly.com/uploads/1/3/1/6/131606672/kixefari.pdf
    • http://sellamorem.com/thermal_resistance_formulav8blg.pdf
    • https://cdn.sqhk.co/pabelewexo/hgQFijN/magireziti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c2317c12-5e73-46fd-a508-2d42a2ef1cc2/8807500314.pdf
    • https://uploads.strikinglycdn.com/files/a62ee07b-bd74-4a62-bbe4-8f6cb7b23caf/kuveguvimolujereb.pdf
    • https://972af30b-04c2-4618-b911-83ba0b7fef9e.filesusr.com/ugd/84a5c6_53b004f5970a4ab2b8a88c3e071c37b8.pdf?index=true
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_dd2efd4da9cc4465a98c8510c373a671.pdf?index=true
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_e8f413eae2ce49b78e332586d335bce3.pdf?index=true
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_e4d72bd7d60349f1851dd40ada95436a.pdf?index=true
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_28e5f924a0af46868b1b3068e8b70e52.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e4df13a-c7d5-41a2-a934-d0441590e838/20204213349.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3ed.bin
ad3d17d8aed99ebd22b26d9ebb4a4c3e394c69907e1d410e1986da20d31df743		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 5104 bytes
font_01_sfnt_off0000f536.bin
58cfd6c0ffb241bdafeeb3e653441bd90c13a619a6536ab20771540f776cb51b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 12268 bytes
font_02_sfnt_off00011dee.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 4324 bytes

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