Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1d254f536a00a8…

MALICIOUS

PDF

83.4 KB Created: 2021-01-23 14:11:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 73544fac82c2187e827dc24721bd2409 SHA-1: fe5764d52c98164d4e2ddbaafa7a821d19fe4030 SHA-256: 7b1d254f536a00a80d97939b828dba22d805ac29e27a909a5e5d7eb4773477c5
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/aws?utm_term=white+cardboard+sheets PDF link annotation
    • https://cdn.sqhk.co/jalegewiguw/dN2uk50/my_talking_tom_gold_run_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409243/normal_5ffc3612e5d20.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/gihNiCA/free_cake_decorating_courses_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gurudulep/jjhjQha/97061348451.pdfIn PDF document text
    • https://cdn.sqhk.co/ninoporaleva/bhhWjdy/backup_data_storage_devices.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422640/normal_600770d0c371d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_5fdbc7f5d0268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465949/normal_5fe5eb9c341f8.pdfIn PDF document text
    • https://cdn.sqhk.co/lidojuxuxiro/Hhjhiii/followers_chief_mod_apk_1._6._10.pdfIn PDF document text
    • https://moviwinexanasi.weebly.com/uploads/1/3/4/3/134314602/zizefasajaxexewutot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_5fd712f79880a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459062/normal_5fde4d7d310ed.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/gjib0hb/90107849831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_5fe631d8369ff.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/hgtWojj/live_call_voice_changer_app_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 5148 bytes
SHA-256: 3351d4dd53d639ad2268ae29a84ea58606a3d7ce8f29210b3509df1f9b0f819b
font_01_sfnt_off00011b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B60 11700 bytes
SHA-256: 1a3bb55da7ed0fa61a4c8c9e11f29b019b037f88e5853c31101aca3eda769056