Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f663c89e9968bf…

MALICIOUS

PDF

67.2 KB Created: 2021-01-29 16:03:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5f0e5f99f7f6c0d123e4461b8f183a51 SHA-1: bb551f7611161e85b3125250b614e3fb38a5810b SHA-256: a4f663c89e9968bfaee681918bdfd8d23d5fd8b6a9333170ef002ecf853ebaf6
194 Risk Score

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=stick%20battle%20fight%20mod%20apk%20home In PDF document text
    • http://nasamipow.22web.org/leferofifulume.pdfIn PDF document text
    • http://centerbluebadge.com/669293334742c6zo.pdfIn PDF document text
    • http://triple-doska6.club/matc_fall_semester_2020_start_daterht1h.pdfIn PDF document text
    • http://dom-bita.org/kamuxovadukik6ut9h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371247/normal_5fcb3f218ce8f.pdfIn PDF document text
    • http://govejulij.22web.org/sheet_music_beethoven_violin_concerto.pdfIn PDF document text
    • http://pink-echo.club/lakshmi_sahasranamatxkqx.pdfIn PDF document text
    • http://mikrotikwizard.com/688228866518a0uu.pdfIn PDF document text
    • http://jokebixa.22web.org/lozofof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xivobotaxonid.epizy.com/life_after_death_free.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/arjun_reddy_songs_bgm.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/arbutus_slab_regular_font.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/mathematics_for_elementary_teachers_activity_manual_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/butafasutawafa.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/sticker_maker_app_for_whatsapp.pdfIn PDF document text
    • http://putazosaw.epizy.com/can_you_automate_excel_spreadsheets.pdfIn PDF document text
    • http://dosunadis.epizy.com/91012966911.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/26617873886.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_off0000ca00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 5600 bytes
SHA-256: 0ec0d17623384436497908c34fbd12c0ddbc0cdb4df7e4dabb24169fd91e231d
font_01_sfnt_off0000dcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF0 10276 bytes
SHA-256: d9fe874a2886eff905dd0a6a1947e8316d226f29ff6a263f9731ba7c83a8db6d