Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c38386be77623f…

MALICIOUS

PDF

71.6 KB Created: 2021-05-29 05:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccbd83d28f40cc6a57fa2ae892c0ece7 SHA-1: 7cdf9c386374e0f02ccd48cc2708da5f0b3178fd SHA-256: 06c38386be77623fce42cb5817a8aa8ce5315793fc5f4b3f1eee6f806d62e4b9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://dafemum.ru/123?utm_term=bridge+to+ielts+teacher+book+free
    • https://static.s123-cdn-static.com/uploads/4380382/normal_5fffb3c3a6853.pdf
    • https://pobowapikojuga.weebly.com/uploads/1/3/4/9/134903403/xibofokoke.pdf
    • https://cdn-cms.f-static.net/uploads/4457312/normal_6031bfec8cd89.pdf
    • https://mepanegeloja.weebly.com/uploads/1/3/4/7/134759112/vulebolabas-xudamajokinunaw-jejomikovusasu.pdf
    • https://cdn-cms.f-static.net/uploads/4404502/normal_6040ed14df379.pdf
    • https://miroguwitofenev.weebly.com/uploads/1/3/5/9/135958286/ruzomarem_nuron_rikul.pdf
    • https://ragajepegoxi.weebly.com/uploads/1/3/1/3/131379061/zupitajavanawutirot.pdf
    • https://cdn-cms.f-static.net/uploads/4505125/normal_602e1b6b1a668.pdf
    • https://wugisawenepo.weebly.com/uploads/1/3/4/7/134749509/7870157.pdf
    • https://rukupapafi.weebly.com/uploads/1/3/0/7/130739745/binud_kawogomim_jijasixexotil.pdf
    • https://majojolug.weebly.com/uploads/1/3/4/5/134595566/687659.pdf
    • https://cdn-cms.f-static.net/uploads/4500440/normal_605c4ed6d0a24.pdf
    • https://cdn-cms.f-static.net/uploads/4402938/normal_60465639d6589.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e5350253-6d58-4830-8694-891e798952d5/71894009132.pdf
    • https://uploads.strikinglycdn.com/files/b515489e-932f-4d01-8773-cd8c16b961fe/python_machine_learning_github.pdf
    • https://uploads.strikinglycdn.com/files/b9d54271-9caa-44a1-b330-041280d92423/lixabofopifagup.pdf
    • https://uploads.strikinglycdn.com/files/48de96e5-85aa-45df-abd2-11962442d999/la_catedral_del_mar_reparto_completo.pdf
    • https://uploads.strikinglycdn.com/files/ca1d61cf-0bd3-47ac-9f4b-fdc79fe87595/zikolatotozudog.pdf
    • https://uploads.strikinglycdn.com/files/0d717750-6d1c-4818-b4ab-9db4dcf1142d/signs_of_extraverted_intuition.pdf
    • https://uploads.strikinglycdn.com/files/420218d6-cc84-4674-a468-f05fc9dd20da/79677523585.pdf
    • https://uploads.strikinglycdn.com/files/e3195895-d6c4-44e8-a635-f778a350ef5a/what_rhetorical_features_are_used_in_the_preamble.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_off0000cc40.bin
5e3dbc6cdcdd6d6051a23f23c114a3743aba025e9b3b8862c07c91690f9d8985		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC40 5220 bytes
font_01_sfnt_off0000de14.bin
0307c403ca91a28ab8ed1593bd952b675a3727d7125809d83ade726b2cb45ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE14 10180 bytes
font_02_sfnt_off000100fc.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 4324 bytes

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