Malicious PDF — malware analysis report

Static analysis result for SHA-256 11186daa6d7bc7a9…

MALICIOUS

PDF

74.0 KB Created: 2021-02-13 11:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 28adc032ef0fc20f2e0ba1e7d2a8cf0c SHA-1: 8eb8c27491cbf360179a1197d6b00ac07eda3529 SHA-256: 11186daa6d7bc7a9021689fc8e5e0bfe42fa0e01990d7deb0496b7c2e050cebe
126 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 Weebly subdomains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://leonvi.ru/wix?keyword=fnaf+1+office+layout PDF link annotation
    • https://ribebofav.weebly.com/uploads/1/3/2/6/132681502/ccd37910f98f.pdfIn PDF document text
    • https://kuweperiti.weebly.com/uploads/1/3/4/9/134904821/3497368.pdfIn PDF document text
    • https://cdn.sqhk.co/soribivevi/TjcF2gd/jowawajiwifipus.pdfIn PDF document text
    • https://fotobuwab.weebly.com/uploads/1/3/4/3/134368258/mefosip.pdfIn PDF document text
    • https://cdn.sqhk.co/mimotulifoti/MgeHQAp/koliya_devdaha_smart_app.pdfIn PDF document text
    • https://remenogabeta.weebly.com/uploads/1/3/4/0/134012297/b8ec0e52b06851f.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/lowogebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_601cce35aa1ce.pdfIn PDF document text
    • http://xevalarebufop.22web.org/25474446033.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/tulabapujagotux.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/jhjbgLf/weather_radio_app_iphone_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_601d3169c5006.pdfIn PDF document text
    • https://jaxoruxevag.weebly.com/uploads/1/3/1/6/131606876/zajopudejoxezivis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376869/normal_5fee0b883d4f6.pdfIn PDF document text
    • https://mapobosani.weebly.com/uploads/1/3/4/3/134385232/noxezivuvot-janulupep-kemexe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448718/normal_5fcd765788013.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lidesesepaz.rf.gd/visijavuxozuxawivuganu.pdfIn PDF document text
    • http://siwufevukopi.epizy.com/22834353305.pdfIn PDF document text
    • http://kikasipab.epizy.com/dosesib.pdfIn PDF document text
    • http://zabipir.rf.gd/98538287213.pdfIn PDF document text
    • http://wetafemef.epizy.com/23818986507.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 4712 bytes
SHA-256: e636de59a478f0d670c3260061b76ac7c3e83ed6cef671d487ecf84e7c457fe6
font_01_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 10240 bytes
SHA-256: 3573975c36460b40af754449f86b1744b6a49843bc1676df5f23ffbbb0ecc647

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