Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a56c21e94e5d9a5…

MALICIOUS

PDF

86.9 KB Created: 2021-03-20 06:13:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3929bfe33cd48b323b94334fa45d04b3 SHA-1: 2639e96363b19cdd0932f6f1e2437e59e5ff6bc3 SHA-256: 7a56c21e94e5d9a51ad1d9fd51cad03e2396367489742ba2f582d9d86e6936f0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=backpacking+recipes+pdf PDF link annotation
    • http://mobile-media.moscow/report_illegal_dumping_austin_texas1g55n.pdfIn PDF document text
    • http://rutenowataba.iblogger.org/concepto_de_equidad_e_igualdad.pdfIn PDF document text
    • http://gufutaca1.xyz/91955934254yi5yl.pdfIn PDF document text
    • http://verifybadgesbusiness.com/how_to_know_what_glasses_fit_my_facep8huu.pdfIn PDF document text
    • http://lifeit.pro/msi_h81m-p33_drivers_free_download8e8ay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5fe89091f0513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_6016023fc8b94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415951/normal_6031e620d2cd0.pdfIn PDF document text
    • http://ig-support-service.com/36059864044ouxoc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408177/normal_5ffb4084aa30c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_603fa78a99e55.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463266/normal_5fe4341d34d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385206/normal_603aecd541dfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suvowafavij.epizy.com/mogugikigapan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf70e44b-c16d-48be-9365-147d89d7d102/panasonic_the_genius_sensor_1250w_silent_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1961499-822f-4ca7-a696-479320da4d95/65431954373.pdfIn PDF document text
    • http://sofidubanelen.epizy.com/dosilesewuligelukevanuvi.pdfIn PDF document text
    • http://xuzetiseke.rf.gd/vilevujusabew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd0d10e-b113-4da4-b42e-a4db4fb99323/53906468735.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_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 5404 bytes
SHA-256: f808eb5abde85db7cfefd6c7ad292e9709f4d122b35d4c45a9309c19189d382f
font_01_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 11620 bytes
SHA-256: 014579f70324345833a957de725ba9a93dbfccf78bffc3798bf6f1577446017b

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