Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e2b5c3ee35e0eb…

MALICIOUS

PDF

104.6 KB Created: 2021-04-07 08:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d51d07c97a020c5ff765a055d3e7a99a SHA-1: f87492efac469cc4d0398980466f394f3786dc58 SHA-256: 11e2b5c3ee35e0eb0dde3087fcf8150f06b57115aafe65b68fce5af289e7a9f4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://nipisod.ru/strik?utm_term=how+long+do+40mm+gas+mask+filters+last PDF link annotation
    • http://xupokaxe.medianewsonline.com/dremel_flex_shaft_collet.pdfIn PDF document text
    • http://damikozukigalow.22web.org/how_does_udp_broadcast_work.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/tuberculosis_diagnosis.pdfIn PDF document text
    • http://falutaburifa.iblogger.org/gta_5_all_cheat_codes_pc.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
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_7a5198cf24f8434e9fc68e40372ae34d.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_43948dbbfb85444b83c998f5facf090e.pdf?index=trueIn PDF document text
    • https://0f7a2101-273c-4f7f-b1fd-079d1ad923c1.filesusr.com/ugd/a7ea6f_e47e5b27515344c6b03ece4d52caa693.pdf?index=trueIn PDF document text
    • http://jikorali.rf.gd/suvedunofi.pdfIn PDF document text
    • http://kaxogesidod.epizy.com/backpacks_mod_1._8.pdfIn PDF document text
    • http://sawudeje.epizy.com/57137713723.pdfIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_0f172fded280407d8974fe4fb85ea855.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_242fbb2b52694e3295ba138343b0a072.pdf?index=trueIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_6ec39b10795c407b8678d8877b4b159a.pdf?index=trueIn PDF document text
    • http://judixipe.epizy.com/donna_piano_sheet_music_lumineers.pdfIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_f4784885256d4f2699a2c16b5ac759ea.pdf?index=trueIn PDF document text
    • http://widifusi.myartsonline.com/49279553011.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_c2a04aa1d2c14b0a8b8a71840ae65d03.pdf?index=trueIn PDF document text
    • https://c039f79f-855f-4b64-8838-30138aeea086.filesusr.com/ugd/6b78cb_5a888faa9e3c42719cfd1fa36e9f7637.pdf?index=trueIn PDF document text
    • http://wimebefivisul.epizy.com/oscar_peterson_night_train_transcription.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13011 5364 bytes
SHA-256: a4fee35e25e862682314c55a3938a539585cd4ed609f1405293ab573a692c61b
font_01_sfnt_off00014243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14243 14944 bytes
SHA-256: 4a37686a73285d1cbc29fc74b479b79ac33770d8889d9b19960dd8cad66b7fbd
font_02_sfnt_off0001720d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1720D 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7
font_03_sfnt_off000186a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186A5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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