Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb81852ee4c605c8…

MALICIOUS

PDF

96.4 KB Created: 2021-04-03 07:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d1c267d0da8ee4b5c225021a78113ec3 SHA-1: 79c7af10a36ea99c4cf8f1fc00dd26bb576e5fcd SHA-256: eb81852ee4c605c8ac521c8e45cd0c0f8519ce6e4a09aa881342d5296e2ccb5a
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be junk data, not user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=acquisition+learning+hypothesis+pdf In PDF document text
    • https://tobopitoru.weebly.com/uploads/1/3/4/8/134872655/vejexenuxofego.pdfIn PDF document text
    • https://patekakedosejot.weebly.com/uploads/1/3/4/4/134479085/tufusi.pdfIn PDF document text
    • https://fovojewonot.weebly.com/uploads/1/3/4/6/134669065/ea012567e137359.pdfIn PDF document text
    • https://majurunonixo.weebly.com/uploads/1/3/1/0/131070356/rudum-xinapoxaxu-milukapofom.pdfIn PDF document text
    • http://xoriruviridov.22web.org/19433923329.pdfIn PDF document text
    • https://bibokesoxi.weebly.com/uploads/1/3/4/8/134850131/nexuposogavama.pdfIn PDF document text
    • https://ponixetuga.weebly.com/uploads/1/3/4/6/134668384/refufakizilimefaxil.pdfIn PDF document text
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/jokufiredon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zexolaxew.epizy.com/nepavazi.pdfIn PDF document text
    • http://nefaped.epizy.com/93453164373.pdfIn PDF document text
    • http://badiwofotafazol.epizy.com/parking_building_floor_plan.pdfIn PDF document text
    • http://wixukitasezi.epizy.com/building_ground_floor_plan.pdfIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_e96bad324be541d9969698ad3b96c9bf.pdf?index=trueIn PDF document text
    • https://4f65703b-d4c0-4c9c-9e30-73c8cc83ec5d.filesusr.com/ugd/54fa57_d06d537278a5466f9f98af9e4cdb4ff2.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_d57c1d8112dd4994935f03b0b4caba4a.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_f5c53e4a58f14b09b3bec7261d14a3b3.pdf?index=trueIn PDF document text
    • http://bubomikofar.epizy.com/pibegofeb.pdfIn PDF document text
    • https://92923600-264c-4cb8-9d87-181083d4f0d6.filesusr.com/ugd/0bf43f_a65ccba0a22c4787be44025a0d0b977a.pdf?index=trueIn PDF document text
    • http://janojunotoz.epizy.com/nordictrack_x9i_reviews.pdfIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_12bb0e3839c249baa8f29c97611886cd.pdf?index=trueIn PDF document text
    • http://gonaviniji.epizy.com/vigovabokibebivibalorix.pdfIn PDF document text
    • http://bagajose.epizy.com/36870678221.pdfIn PDF document text
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_b64ee68dd9354f26ab8b9aa1532bc775.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 5636 bytes
SHA-256: 3e74db90bcf2e6a185b1b4326c10ce42d5b1bbbd32a31f497d9f8bb620f24b23
font_01_sfnt_off000136d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D1 11992 bytes
SHA-256: f9d827ec2c319b5396fbdc413f32f58a880d4ed8fa6c965d14000d40a23b77db
font_02_sfnt_off00015ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC9 16136 bytes
SHA-256: 8d0ca5441952925faa6f68d28470995fcd5e3edd800b1977fac83179433ae1db

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