Malicious PDF — malware analysis report

Static analysis result for SHA-256 728ab974ca1cd13c…

MALICIOUS

PDF

75.6 KB Created: 2021-04-08 12:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1e13f3f7c744d55b7c3b0e7bf239fe97 SHA-1: 5e47331eed3d2668e944894e3da3031858b9c1ac SHA-256: 728ab974ca1cd13c619627b2d0f68edf2c8cd7908429a663d35fe3667391ea3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=phonics+workbook+pdf+grade+1 PDF link annotation
    • http://vajukadezazi.getenjoyment.net/o_reilly_algorithms_in_a_nutshell.pdfIn PDF document text
    • http://ratapadeko.22web.org/is_pimping_a_crime.pdfIn PDF document text
    • https://cdn.sqhk.co/bobavijiwoba/fTifChi/22960210318.pdfIn PDF document text
    • https://cdn.sqhk.co/bafebolabefo/ijbicZD/49462313092.pdfIn PDF document text
    • https://cdn.sqhk.co/luvutagawata/hiajjii/circulatory_system_worksheet_middle_school.pdfIn PDF document text
    • https://cdn.sqhk.co/woxutonezem/fejbuif/dufanovabatise.pdfIn PDF document text
    • https://cdn.sqhk.co/wumerelup/ijHTIic/30947660997.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_ccf9c04e036547fc9385cbb216d3da83.pdf?index=trueIn PDF document text
    • http://widusop.atwebpages.com/10498166438.pdfIn PDF document text
    • http://godemesefiw.epizy.com/jivizutebe.pdfIn PDF document text
    • http://votixeju.onlinewebshop.net/95066230075.pdfIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_ce531e2319cc44a2a30464ff78969cd5.pdf?index=trueIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_c9da74e1bacc420785ef213d18b8cb84.pdf?index=trueIn PDF document text
    • https://786c536d-253b-4a15-94df-129c4693a223.filesusr.com/ugd/1fc311_1ce0543b33d048f9829e2a4ebd101e43.pdf?index=trueIn PDF document text
    • http://tanonarimunal.myartsonline.com/les_autodafeurs_tome_3.pdfIn PDF document text
    • http://nibudikugi.epizy.com/list_of_5_star_hotels_in_dubai.pdfIn PDF document text
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_d388935ad56247d880ee538b57b43f33.pdf?index=trueIn PDF document text
    • http://jekurur.atwebpages.com/6144648480.pdfIn PDF document text
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_d4e82621b1934f16998e20b802031029.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_15fa22f9831e4502bcfdd2f69edeec6c.pdf?index=trueIn PDF document text
    • http://kamegil.epizy.com/xotobaguvakomulo.pdfIn PDF document text
    • http://vipukexevuwe.epizy.com/are_vicks_plug_ins_safe_for_babies.pdfIn PDF document text
    • http://madepug.rf.gd/nfl_injury_report_week_10.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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 5732 bytes
SHA-256: 053a842c7cd531883eace2c3cc999a511f3d260988f25252f6fba629263e4c4f
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 10772 bytes
SHA-256: 58260c5331324179b9d016b990adb9665617b354f0646cceb9da1ee147a7c6c8

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