Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea90f6ff9546780a…

MALICIOUS

PDF

79.1 KB Created: 2021-03-15 04:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae60fde93107e33528e0f1566aaa8d5d SHA-1: 48fd6ff57c6f702d4e52ec77974c8c6cc518e486 SHA-256: ea90f6ff9546780a12cb1f57e7fa93a75104c702fe43ac8118747931816cc67d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a mass external link farm, with one primary URL pointing to vilenefex.ru, suggesting it's used for SEO spam or phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful external content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=functional+culture+region+example
    • http://bubble1.space/life_expectancy_of_lennox_pulse_furnacekfefa.pdf
    • https://cdn.sqhk.co/judigirowe/gijaChU/tijofuroregololibovakobo.pdf
    • http://viewcreditscore.info/vigoxalbpoe.pdf
    • http://copyrightsupport-ig.com/bukurawemidagesekilin1pyl.pdf
    • http://antonioit.fun/60944086724bgqk.pdf
    • https://cdn.sqhk.co/dofexoxev/egejigj/vozirurubipu.pdf
    • https://cdn.sqhk.co/gadukupuwe/9gehbib/8592432621.pdf
    • https://cdn.sqhk.co/baxotonad/ihkidWz/27699866728.pdf
    • http://bbbbbbbbeeee.space/syed_ul_istighfar_download5b65y.pdf
    • http://look-hotel.com/dotoxizijekufuzosawigi5rz0f.pdf
    • https://cdn.sqhk.co/dumadomizore/MiMohgi/14064306396.pdf
    • http://mon-compte-cmb.best/rujikubizusixakigawesunubqjun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_6ccf6b83174d47709820994498922513.pdf?index=true
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_fb955ded41e24755bddce620d2e3e93d.pdf?index=true
    • https://318abaa7-a496-4882-a5ef-186b1d719b20.filesusr.com/ugd/ff2e65_cba5218d3c2042e688c6f6a9d9df5aa2.pdf?index=true
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_1deb6303d3454ae69c97716feb9e9ede.pdf?index=true
    • https://0315d410-4255-45a3-9477-873949dd02ac.filesusr.com/ugd/f85006_c6c5539a6bdf43a4934d174b7df33ecd.pdf?index=true
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_0472f610eebb49feae2f989f5607a57b.pdf?index=true
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_ff7065ad5a2a4154b369a974c1dc66ba.pdf?index=true
    • https://76a725e8-946c-4ae9-9249-cda469d35108.filesusr.com/ugd/83c8cc_65c885b3d4c14505900b1fe4db58b6a2.pdf?index=true
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_d7f86cf8fb1041bf850a0b945a2d222e.pdf?index=true
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_f4e439c617244460951068c45470a1fe.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f700.bin
80a3d7005a10d83387451cdd44e23290e1d94d337b2c89f28f517f4267cbfca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 5100 bytes
font_01_sfnt_off0001084d.bin
f9ddf305f618c08946f3b2d2db6e273df8dbf59b545ddebd901dd7c19f558085		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1084D 11668 bytes

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