Malicious PDF — malware analysis report

Static analysis result for SHA-256 a907ece885e1399c…

MALICIOUS

PDF

71.1 KB Created: 2021-02-28 21:16:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: cbae99526d08065057b46923711c3f72 SHA-1: f7a8af50620a9dd0d6b68647e8ea5bab43149e30 SHA-256: a907ece885e1399ce74604bdb44f2f7ddcdbad8867109bba430f9fde155ae355
136 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
  • 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://gimoguvi.ru/award?keyword=foundations+of+algorithms+5th+edition+solutions PDF link annotation
    • http://leree6.club/semiologia_porto_7_ediC3A7C3A3oy2auh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_6003268d8d766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_6035ff0a35939.pdfIn PDF document text
    • http://sarhello.online/kaxovuvexdbh9f.pdfIn PDF document text
    • http://lidzadva.xyz/jazigupilenoxajigubobufuy2m59.pdfIn PDF document text
    • http://khanapoorti.com/kutukipaj3hxs4.pdfIn PDF document text
    • http://fartook.online/nikon_35mm_f_1.8_g_af-s_dx_photosujgr8.pdfIn PDF document text
    • http://ketrovk.xyz/ziwalewijaludjx2mt.pdfIn PDF document text
    • http://rululidevasuv.22web.org/seleg.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
    • https://s3.amazonaws.com/fojaxexino/44759207241.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/42067287082.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/vezejuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/kejimobegomivapomaje.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_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 5280 bytes
SHA-256: 9b6080b506ca74fb7e36837fb7426f11e4c876fc04e7a0d622123615189311f1
font_01_sfnt_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 10080 bytes
SHA-256: 9403586b9683cb64e834247b819b15997b2ae7359bbfea55e3f13036cfe58ed0
font_02_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71