Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5488ebb239cc42…

MALICIOUS

PDF

68.4 KB Created: 2021-02-23 05:36:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 472b982f24fa59d7c46b0477c4884ca0 SHA-1: 83061dcb48ce0ae27eef7acd4e8418ac40ec5657 SHA-256: 2f5488ebb239cc42474dad426deb1dfeaec3d90e11b9ae0a4bef35d5f955ef05
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/wix?keyword=sink+and+float+lesson+for+kindergarten PDF link annotation
    • https://wakebanimoxebej.weebly.com/uploads/1/3/1/3/131383753/c6b1a.pdfIn PDF document text
    • https://cdn.sqhk.co/nowovadizeb/Tfeictl/tatezipe.pdfIn PDF document text
    • https://cdn.sqhk.co/zajujinul/nPgiqGh/big_bang_evolution_game_all_bombs.pdfIn PDF document text
    • https://polatubogo.weebly.com/uploads/1/3/4/5/134598163/kobesegoke.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/gejhKhc/zupane.pdfIn PDF document text
    • https://cdn.sqhk.co/nozelenid/vjiHihL/bug_a_salt_3._0_home_depot.pdfIn PDF document text
    • https://vejamepune.weebly.com/uploads/1/3/0/7/130776484/5671583.pdfIn PDF document text
    • https://linoraza.weebly.com/uploads/1/3/1/4/131437671/josolekunod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pigolo/blocking_restricted_numbers_on_android.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_off0000d1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 5244 bytes
SHA-256: e8e7fee7190f8d49e102abec9d8a25f858fbe73e5a1e0b4abbb7348e319aae4f
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 9904 bytes
SHA-256: 09e693128d8a36019d5148cebfe14e210639e546e0019c5407be430e5de8d8fa