Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca50bd2b98449245…

MALICIOUS

PDF

89.2 KB Created: 2021-03-16 17:57:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7f7c154e104d18a3a5b7d62ee611b75 SHA-1: b5c4ba4fb3df8029a6560426d1111960f6757b40 SHA-256: ca50bd2b98449245adf8e0f20bd7d43500e45a14884e687b9c6bac2268a5426d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a mass of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous external URLs strongly indicate a malicious intent to redirect users to potentially harmful content. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/wix?keyword=12+answer+sheet+xerox+copy
    • https://cdn.sqhk.co/zetanitanedo/WLo3OxC/53317123468.pdf
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/ab9fa9867929bd.pdf
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/1542612.pdf
    • https://dutimuju.weebly.com/uploads/1/3/4/3/134334277/maliferipapom-sujenaziw-vemumijifot.pdf
    • https://puroporutenes.weebly.com/uploads/1/3/1/6/131606954/5332303.pdf
    • https://cdn.sqhk.co/lalamiteliw/ghhfghT/bedaraderidariwawasup.pdf
    • https://xiriwedonup.weebly.com/uploads/1/3/4/2/134265341/375913.pdf
    • https://nosugorowemuz.weebly.com/uploads/1/3/5/3/135327492/pojurikiro-bupizes-bivijewipabix-xavamavopek.pdf
    • https://gixebufenof.weebly.com/uploads/1/3/6/0/136082423/depufafosud.pdf
    • https://femobideja.weebly.com/uploads/1/3/4/7/134735935/kumisarovop.pdf
    • https://fenejetamop.weebly.com/uploads/1/3/4/6/134697978/bezosur.pdf
    • https://cdn.sqhk.co/pabefidinaz/a342CjG/bejeweled_blitz_facebook_app.pdf
    • https://cdn.sqhk.co/tiwefuxab/CgduhbW/71516645878.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://s3.amazonaws.com/ganubifirigevi/23417627856.pdf
    • https://s3.amazonaws.com/fogibi/gametv_plus_moi_nhat.pdf
    • https://7afcd0b8-98df-42a4-afe0-9544d44c9539.filesusr.com/ugd/74e9cf_0f9455c9960c4c48a82b74384027c181.pdf?index=true
    • https://s3.amazonaws.com/mesixadelomomo/74000768300.pdf
    • https://uploads.strikinglycdn.com/files/a829c57e-4054-43a9-83af-56bbe68c42f0/goketekenupipefadedareb.pdf
    • https://uploads.strikinglycdn.com/files/604f8847-4506-4673-a78e-a664e57865ab/la_divina_comedia_autor_del_libro.pdf
    • https://uploads.strikinglycdn.com/files/d22254b6-0427-4a33-b139-8f3ae6937200/76489765141.pdf
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_ddec0a8e8b514f4cb7012f28737a85b9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8e9.bin
c1fc1526bb25e65fa2d19b61c976a90d6fed6cabd1f77ee3c7a88bff1925bc8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 5340 bytes
font_01_sfnt_off00010b2e.bin
78b586759c103332d7734f09c6bb19467d8372cc5743ee3b3dfc096c787fb319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2E 17412 bytes
font_02_sfnt_off0001330d.bin
dfe15933e42274f4e446aa801db2ff1a19d00591aa6d7b94babca2228cb08cd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1330D 10428 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.