Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c78ac697b2a4ca1…

MALICIOUS

PDF

80.3 KB Created: 2021-03-27 11:21:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: dd49eee11c04f656e911d5635756dd06 SHA-1: d7977c6cbd89a117a4360112da0bf176efb8e611 SHA-256: 0c78ac697b2a4ca1dbf69008cc08edce01c18d689dfe2786804f1fb7e4b82c46
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one pointing to 'jumiwimov.ru/award', suggests a phishing or credential harvesting attempt disguised as an employee performance evaluation. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/award?keyword=employee+performance+evaluation+sample+pdf PDF link annotation
    • https://cdn.sqhk.co/xufuwejaxe/bYmCifO/subozamaxuzomevoge.pdfIn PDF document text
    • http://gakarefutejet.iblogger.org/sutawamulibusomofome.pdfIn PDF document text
    • https://cdn.sqhk.co/tarekekog/hjbcWgj/vonovewumofezapozogusug.pdfIn PDF document text
    • http://wedavinonuvovu.22web.org/android_alarmmanager_notification_example_github.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://voxedolap.epizy.com/android_tablet_with_integrated_portable_dvd_player.pdfIn PDF document text
    • http://watijosanowo.epizy.com/fenotepavojabukisotoj.pdfIn PDF document text
    • http://vanudedu.epizy.com/jinko_solar_pv_module_datasheet.pdfIn PDF document text
    • http://budivisatenebo.rf.gd/51105395734.pdfIn PDF document text
    • http://segugixitibuka.epizy.com/is_nordic_skiing_hard.pdfIn PDF document text
    • http://jimanujomubil.epizy.com/bhai_status_video.pdfIn PDF document text
    • http://jotinonikudodi.rf.gd/typhoid_fever_story.pdfIn PDF document text
    • http://favigagiwu.epizy.com/nexus_9000_macsec_configuration_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef539197-92b3-4f89-a064-b8c3f0841681/48032241476.pdfIn PDF document text
    • http://felakaselik.epizy.com/87426104511.pdfIn PDF document text
    • http://jigugepolega.epizy.com/back_pain_exercises_nhs.pdfIn PDF document text
    • http://zadarubumu.rf.gd/the_evolution_and_characteristics_of_the_information_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/349c6652-c780-4e06-a18b-3a8feedcff15/remixorevumawega.pdfIn PDF document text
    • http://redebalumu.rf.gd/86719044103.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 5304 bytes
SHA-256: 24d33c085cdc67bc2316f8ae19740488d7a4275aa38985998b68004a7adf5282
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 11156 bytes
SHA-256: ea66db968e7ab0cfeade9ae75762d964c3153b2b6b228f923cb9d6308d507158
font_02_sfnt_off00012595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12595 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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