Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6e8a52c7fff5dc…

MALICIOUS

PDF

76.6 KB Created: 2021-03-25 22:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1ee0dfc4fed232ba8179475988d44a27 SHA-1: b75a7b3f36f0994317c08f75b10f80d06ae33467 SHA-256: 4b6e8a52c7fff5dc1522947ec0421fc75c2257d28a54b503e40903df91b845b8
176 Risk Score

Malware Insights

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

The PDF document employs a lure for free downloads, directing users to a malicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were extracted, the embedded URLs and the nature of the heuristics suggest a phishing campaign aiming to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://kuzutuzo.ru/strik?utm_term=which+css+framework+is+best+for+angular PDF link annotation
    • http://afracheat4.xyz/html5__css3_for_beginnersooil8.pdfIn PDF document text
    • http://cabinetshub.xyz/fuvefudamuvitipemusufor224zr.pdfIn PDF document text
    • http://tugidunamoz.22web.org/psn_mail_checker.pdfIn PDF document text
    • http://blubadgehelp.net/business_manager_jobs_londonmktkk.pdfIn PDF document text
    • http://yachts-4-sale.com/59284118729f2fe.pdfIn PDF document text
    • https://cdn.sqhk.co/menaleratupo/gjbEgh3/rush_truck_center.pdfIn PDF document text
    • http://lamisorosasam.mywebcommunity.org/pifazujiveniwowuzami.pdfIn PDF document text
    • http://nakanilo.club/att_u_verse_tv_schedule_todaysq7n0.pdfIn PDF document text
    • http://livobagoxepat.iblogger.org/what_is_the_jesus_movement.pdfIn PDF document text
    • http://kino-vezde.ru/87039716276x238u.pdfIn PDF document text
    • http://instapodarok.site/why_is_my_foodsaver_stickymsjo7.pdfIn PDF document text
    • http://kitukotobov.medianewsonline.com/colombo_development_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/9tp1haq/40462501638.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/majalezipitaki.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/pulujolatepuv/variance_and_standard_deviation_ppt_slideshare.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/crib_sheet_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/formal_absent_letter_to_lecturer.pdfIn PDF document text
    • http://bosadubarelazu.rf.gd/zimapevibuluwe.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/abashante_free_songs.pdfIn PDF document text
    • http://fabonek.rf.gd/70440219266.pdfIn PDF document text
    • http://pijedawometuzov.epizy.com/49209866200.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_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 5604 bytes
SHA-256: 7cf3fcfcb2a44e9a6bf4be292fdbcb188365d1f3d1aaa6d10dfb939d8e0abcb0
font_01_sfnt_off00010068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10068 10996 bytes
SHA-256: 72c6e74ce8ba132119bf6becc1778796bb21640914744edc01bce81e9c6d8bc7

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