Malicious PDF — malware analysis report

Static analysis result for SHA-256 51358814e4636aa9…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 18:47:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 91615574007adb187454142d566ff381 SHA-1: 2090f839da466e17520a1795580ef208b25baaba SHA-256: 51358814e4636aa93af75627608d41f85db51fe1cd8ba16d8af7195403742a40
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or redirecting users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://jacksth.ru/123?utm_term=zoom+crystal+report+viewer PDF link annotation
    • https://cdn.sqhk.co/nedabuke/ghejaii/star_falls_cabins.pdfIn PDF document text
    • http://zatawonilar.iblogger.org/tedopufitawojavavuze.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/nU5d6hb/80846635093.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/fgcVbKk/charcoal_barbecue_grills_at_home_depot.pdfIn PDF document text
    • http://xumosigebazu.iblogger.org/tefuwabuda.pdfIn PDF document text
    • https://cdn.sqhk.co/vekasurox/5iihbjb/old_pinball_machines_for_sale_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/ggedjeC/kaguv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_6012e3fc809f8.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/rjgiboU/sobewudulajunori.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/ahggfif/jevofomegeteguzesikawosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493917/normal_602df0bb3360c.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/jjggjiI/30475002114.pdfIn PDF document text
    • http://wazalugele.22web.org/56507795315.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459175/normal_5fe0d95d9441c.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/cjeiihY/chamamento_ao_processo_trabalhista_reforma.pdfIn PDF document text
    • https://cdn.sqhk.co/wabitakenina/cTrjgji/marketing_manager_salary_california.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_601eabafc29bb.pdfIn PDF document text
    • https://cdn.sqhk.co/moboguvafuze/ohjjigg/excel_delete_sheet_rows_greyed_out.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad28c3be-6f72-478e-9c6d-22a294af8ddf/mawemexujomajeke.pdfIn PDF document text
    • http://tokumizexafu.epizy.com/zusafadexexejifugimetogez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/202569d1-54ba-4158-8f29-7d06a7fb5d80/varozumedumuwitesir.pdfIn PDF document text
    • http://xamorapex.epizy.com/the_book_of_life_movie_streaming.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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 5292 bytes
SHA-256: 87d70e92f734cc77b557453056efe5f7725fb9aea21cb81a99c0b22c5022d259
font_01_sfnt_off0000efaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAA 10380 bytes
SHA-256: 29118f61676cb99d5685d023bc18e6e0b4c7dacd61260edfc1858160dfc41bd4
font_02_sfnt_off0001133a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133A 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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