Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5585a19e9d3d83…

MALICIOUS

PDF

70.5 KB Created: 2021-03-23 01:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45099f138bca9b8629208d230daab254 SHA-1: 74b272304713ac4ffa876fdd9f6845af31b3abbf SHA-256: 2d5585a19e9d3d832db672f5f047e222b34e6c7fe14f8d95ca02246d04d067b9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest this PDF is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

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://jumiwimov.ru/wix?keyword=animal+tissues+worksheet+answers
    • https://cdn.sqhk.co/tidilotofuka/d54gehg/zogubiwin.pdf
    • https://situzofunuk.weebly.com/uploads/1/3/5/3/135305293/minekowilido_bumix.pdf
    • https://cdn.sqhk.co/godezixibufo/hewTEZN/pastimes_pub_grill_columbus_oh_43085.pdf
    • https://tixafaxul.weebly.com/uploads/1/3/4/3/134311963/e07bdfec.pdf
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/f54ea8b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ad152040-3da2-4ecb-868b-5b863e3526a1/chronological_order_of_mark_twains_books.pdf
    • https://s3.amazonaws.com/tomamujuf/autocad_tutorial_free_2017.pdf
    • https://s3.amazonaws.com/wanalovum/gusoduz.pdf
    • https://s3.amazonaws.com/vukujidor/liwiruvo.pdf
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_0427783d2b1d41d987f1d5ae53a2a8f9.pdf?index=true
    • https://s3.amazonaws.com/kukupunopedon/65581386636.pdf
    • https://s3.amazonaws.com/rakabexozu/sharp_el_1197piii_manual.pdf
    • https://uploads.strikinglycdn.com/files/86bd4a9f-cb59-4ff2-b70a-3b477c0a2a28/82409836750.pdf
    • https://s3.amazonaws.com/gizonukorad/commutative_property_of_addition_1st_grade_worksheet.pdf
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_38ce0bc2671b47d59ead307697b510c0.pdf?index=true
    • https://s3.amazonaws.com/fukezavazuj/1290397600.pdf
    • https://s3.amazonaws.com/wujafivabipo/how_to_configure_cisco_router_wrt54g2.pdf
    • https://s3.amazonaws.com/nisoxow/fusetegebaxebowuso.pdf
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_29ea03d1cb794dc9a8bc4fabb62ee464.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cc725aac-b75d-427b-bdb6-b151788b5fd5/agudas_llanas_y_esdrujulas_4_primaria.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d88e.bin
17d9714234dc675ca87aaca87d0e8c077bfe87abdc8359e5942eb486b2909bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD88E 5072 bytes
font_01_sfnt_off0000e9aa.bin
364e58de75d35a311f947d79c59c6f2b1835a31c852cdaf16f15b36c1def00a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 10216 bytes

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