Malicious PDF — malware analysis report

Static analysis result for SHA-256 545535e84ebfb1d7…

MALICIOUS

PDF

157.3 KB Created: 2020-12-31 22:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 58939bf26e3a8d0e895bb8224f49cdbf SHA-1: ea475cfb886d8b6c83b2991c28d161c960c7d968 SHA-256: 545535e84ebfb1d71ba668ef75c7bded9828661ed5bfbe9a903caca7e394721c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to harmful sites, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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 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://traffine.ru/123?utm_term=cast+of+stargate+sg1 In PDF document text
    • https://cdn.sqhk.co/nanuvoxeva/gipdhjU/commercial_aquaponics_design_plans.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/9694014.pdfIn PDF document text
    • https://dezegumi.weebly.com/uploads/1/3/4/1/134108828/vevikazumafano_vufoweresiz_kovaxusumoma_jilobulakiki.pdfIn PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/02668db53e6bd.pdfIn PDF document text
    • https://supekekimut.weebly.com/uploads/1/3/4/8/134871395/pepili_varenoka.pdfIn PDF document text
    • https://renepavavoz.weebly.com/uploads/1/3/4/0/134012855/a6b84834930e2c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dozuga/ahmednagar_fort_information_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/composition_of_functions_and_inverses_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/883ebaea-7d20-4633-9629-9735665a2d32/cups_without_straws.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339b3a5a-7bee-42b8-9d47-33b8a6ecb2d5/gotiwofitupezotex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2c4ead-995c-4e75-9896-8cc5a4f2c9da/30768622320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d47b60-5549-4165-8602-c7cb76c0e21e/zariv.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/the_unspeakable_act_2012_full_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2170A 4860 bytes
SHA-256: 25f50f0fb24099ba2f11d86f8917a730edf5a833a79e908522de8a7d3badcf6c
font_01_sfnt_off000227a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x227A5 13404 bytes
SHA-256: 4b810075294dce2553dc92f2d4f16a5e111baa208d42ddea59111fa2f912cfde
font_02_sfnt_off00025274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25274 16168 bytes
SHA-256: ef897ded66bafa63388547ba73fb8b495b240a467ca264047008c5916b93874b

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