Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4e0b007cbb4dc2…

MALICIOUS

PDF

85.7 KB Created: 2021-05-30 09:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9687ac36725e650205e38dd3d7025cc8 SHA-1: 13f3b50cf4bd140ebc30a95cba3624e37a9288c1 SHA-256: da4e0b007cbb4dc2a76d8b86aa54f3d9d0bd4a0e229f74be366b11a41f20cc6a
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/strik?utm_term=essay+writing+topics+for+6th+grade PDF link annotation
    • https://rumirasikimuzib.weebly.com/uploads/1/3/2/7/132710795/xiragisilamunedizuli.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/8596210.pdfIn PDF document text
    • https://jijovozezara.weebly.com/uploads/1/3/1/1/131163872/9ee617ed56cf46.pdfIn PDF document text
    • https://novifabapidujup.weebly.com/uploads/1/3/5/9/135975767/837027.pdfIn PDF document text
    • https://pekedilude.weebly.com/uploads/1/3/4/3/134324883/rojidivakazuw.pdfIn PDF document text
    • https://depoferi.weebly.com/uploads/1/3/4/4/134445349/8455453.pdfIn PDF document text
    • https://pimejowutaviju.weebly.com/uploads/1/3/4/4/134495028/rolisalofe-rixebujafav-xizetov.pdfIn PDF document text
    • https://tuzenuzibawura.weebly.com/uploads/1/3/4/7/134733138/fusumojopuragasiki.pdfIn PDF document text
    • https://tomasuniraruz.weebly.com/uploads/1/3/5/3/135392941/7cc2c066.pdfIn PDF document text
    • https://morupataniseb.weebly.com/uploads/1/3/4/5/134502176/bajiwupobabuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450244/normal_60550eb15fd1f.pdfIn PDF document text
    • https://vifesomojijafi.weebly.com/uploads/1/3/4/3/134337648/45de9f816da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379362/normal_6012885e5e7a2.pdfIn PDF document text
    • https://gusinunizu.weebly.com/uploads/1/3/4/3/134380178/5316b0bcaea.pdfIn PDF document text
    • https://bavutenodedob.weebly.com/uploads/1/3/1/0/131071315/e6d4d019c239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490735/normal_5fe864fc2e074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501995/normal_6000f9385de05.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_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 5480 bytes
SHA-256: c25509f980557c7766152207e0adce5b1e25085ca439bd1ec36abd35700de393
font_01_sfnt_off000115d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D2 11036 bytes
SHA-256: e7103c8de6efb666a306393f7cc933281691c7440ab6cde45e7a8048448b8a44
font_02_sfnt_off00013b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B72 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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