Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a9f7162c8d28be…

MALICIOUS

PDF

76.8 KB Created: 2021-04-12 23:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9633831b1b33bc238a6aa060b01f2db0 SHA-1: 78c214ed820ebb0e141fab6b6f73e3c3a8604f33 SHA-256: b7a9f7162c8d28be3b4dc957b411983be0f2b69dd402a1cab96a0590bc30b487
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The embedded URL and heuristic firings point to a lure for a free download, redirecting the user to a suspicious domain. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, suggesting it was generated programmatically to appear as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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=craftsman+12+inch+band+saw+model+113+manual PDF link annotation
    • http://zdsshop.top/downy_dryer_sheets_and_mosquitoes5487h.pdfIn PDF document text
    • http://bostpolamos.site/kinemaster_pc_download_apk0nf8q.pdfIn PDF document text
    • http://oneitstore.pro/jabariya_jodi_full_movie_300mb0o6ek.pdfIn PDF document text
    • http://purpless.vip/kevifumpsrsc.pdfIn PDF document text
    • http://1xbet-registr.site/25840145789r2h6w.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/5f0a232c-2986-4a19-995f-757b28bd7516/73079334384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f30aecfd-ddcf-4b8f-b144-8951c6eac3ef/mezawixonojitiroz.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/46413974700.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/mill_on_the_floss_restaurant_for_sale.pdfIn PDF document text
    • http://temimakidifidib.rf.gd/fegixewuxikazudifaze.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/femenowegobavifofizebi.pdfIn PDF document text
    • http://nepopenezum.rf.gd/77080143232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9b982c-6a46-4273-b373-fb81df58c6e1/strength_to_love_speech_1963.pdfIn PDF document text
    • http://kuminatunajovop.epizy.com/appoint_director_paper_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/84426287149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb70cac-7526-40c0-abf6-510db407ef0a/solotunenen.pdfIn PDF document text
    • http://kinapemib.rf.gd/xovuw.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/pewusogofelefonutez.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/jupos.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/betty_edwards_drawing_on_the_right_side_of_the_brain.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/algebraic_expressions_worksheet_grade_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a87a9d5-2161-4d7e-8d34-c5bb957959d1/bedejukuzolizisubida.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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 5744 bytes
SHA-256: 65caf54983341c288f8cc9abc63d76d618687247ce6ec59d90277711cd971ff4
font_01_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 11596 bytes
SHA-256: a3a428e49143e91e9d93403b7e7626da3246b0b25b424880cc7e28ccf780d986

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