Malicious PDF — malware analysis report

Static analysis result for SHA-256 921b5bde5c97537a…

MALICIOUS

PDF

81.8 KB Created: 2021-03-20 04:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76f0d81b301225edf6987fab7b451964 SHA-1: 5b3d3d050a356a30d3b7beb917a53047e121a2c4 SHA-256: 921b5bde5c97537aaabbfc2bc9351bd35d4c675b01ac8775f82cb98cc8de8d6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains a mass of external links, including a suspicious URL pointing to a potential link farm or phishing page. The document body, though heavily obfuscated, contains keywords related to a superintendent search, aligning with the external URL's keyword. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=district+60+pueblo+superintendent
    • http://drenajkrasnodar.ru/77715768977iyibp.pdf
    • https://static.s123-cdn-static.com/uploads/4460063/normal_5fefa96a4d154.pdf
    • https://cdn.sqhk.co/gituridewo/haxghgA/sprint_sprint_instant_win_game.pdf
    • https://cdn.sqhk.co/xeloxilava/Nhcibjj/smiggle_snake_puzzle_ball_instructions_step_by_step.pdf
    • https://cdn.sqhk.co/baruduwege/oghibly/taxoruxixilife.pdf
    • https://static.s123-cdn-static.com/uploads/4417315/normal_5feb746f1ce78.pdf
    • https://cdn.sqhk.co/dibirolinu/Dc5ehgm/goalrilla_basketball_hoop_instructions.pdf
    • http://serdyukov.pro/46443013456lpgk4.pdf
    • http://7lessons.site/mufokotibigakouv2i0.pdf
    • http://hallop.xyz/79358258965b8ww.pdf
    • http://it50life.pro/answers_for_tesco_application_form_questionnairec6b5d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_d375adf9c1a4467a8d362327c6129c23.pdf?index=true
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_f2c45262e20b41cc9dc5be30f62d2c1b.pdf?index=true
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_bcd2db3bbf834148844cc58cc67b7e7f.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_ff8b4c2b8cfc4aa9a28afa85ed0f82c3.pdf?index=true
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_5f9cc78cbd1046bebf7cbce82805497f.pdf?index=true
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_ab244c04450a4f618fd14fd1440cbf5d.pdf?index=true
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_4ad0c078b0994996a5b041ab9930c3d2.pdf?index=true
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_759e57f091394888868059d58af7bb94.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_off0000f170.bin
154eee3e64d3b065671fb01eee14f0248b757bd27372f71b92fa9ebcc9a8c29e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 3892 bytes
font_01_sfnt_off0000ff61.bin
6b061864bfcdce24e272d0b07ef35080a35b45a18888310ff44db333a752c649		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF61 5292 bytes
font_02_sfnt_off00011167.bin
4bfcd4a306f4653a6886fb9f3e0410238bb0131fdfbadb9358a1969b17a96093		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11167 12356 bytes

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