Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a2ac66310fef5d…

MALICIOUS

PDF

75.8 KB Created: 2021-02-18 18:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: c4f555b4bb1d8caa454e375ec23ffc24 SHA-1: 7769d71813cd9f6a7f500971e25c20863756f81e SHA-256: 07a2ac66310fef5d41c28fa91c137c8888d83bd1d3599d58bb08b165ee3d47a9
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to USB power issues, directing users to external sites.

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://jacksth.ru/wix?keyword=usb+accessories+disabled+unplug+using+too+much+power PDF link annotation
    • http://kersita.fun/nelanupupe76qu0.pdfIn PDF document text
    • http://vbruti.site/sindh_high_court_reported_judgements2wsci.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxokakijefe/if1iihe/36701860486.pdfIn PDF document text
    • https://cdn.sqhk.co/mogujawogo/eCgiZtU/animal_coloring_color_by_number_paint_by_number.pdfIn PDF document text
    • https://pexekakuxop.weebly.com/uploads/1/3/2/8/132814074/migemajokubumi.pdfIn PDF document text
    • https://rofunepez.weebly.com/uploads/1/3/2/7/132710772/3531978.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/kopixose-zosuloveve-tarimu.pdfIn PDF document text
    • http://astrology-personal.online/orchestra_video_mp4m45mk.pdfIn PDF document text
    • http://tk-time.site/faxugufidarozad7w9ss.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/tajabona-pipilewud-nubebeli.pdfIn PDF document text
    • https://cdn.sqhk.co/kagawupatow/pISicpo/metta_world_peace_tweet_cantu.pdfIn PDF document text
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/9939538.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/mafiku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuriruzuminomu.epizy.com/android_studio_in_ubuntu_18._04.pdfIn PDF document text
    • http://rasijubesu.epizy.com/java_graphical_user_interface.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/vimuzanubogerudowoverisi.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/57458898473.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_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 5712 bytes
SHA-256: 858ace8af53606a59e079276e910a0749259791d4c9d52b854eabdf901dad698
font_01_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 10668 bytes
SHA-256: 1eb25fa7fa3af9171a56d1cb1c33bb27fac34f6f32027b8df1586a032af64e07

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