Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe434d0ee60cd98…

MALICIOUS

PDF

76.2 KB Created: 2021-03-20 19:52:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 046ac6b6e3ab72374d834dfb5d190288 SHA-1: 3311e3d208169fe17f28b237d2dbbde162dbcd96 SHA-256: 5fe434d0ee60cd98db15d8bd75d2ab499cf481817b56f42c12fb69a640f1a6b3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/123?utm_term=best+cover+letter+template+pdf
    • http://good-production17.site/solving_quadratic_equations_using_the_quadratic_formula_calculatorovija.pdf
    • https://cdn.sqhk.co/kigowabalo/jjdjgNv/62129360582.pdf
    • https://cdn.sqhk.co/kikolibub/hjiPgcd/carnot_heat_engine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_5720d1abe3fe470dbb969f9e2b81295e.pdf?index=true
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_9fd172a9cd3b4d24b27e35962290f237.pdf?index=true
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_2e04446049b7450fabfcf6efcb606d94.pdf?index=true
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_493311444f00458b825a6ff045b5b977.pdf?index=true
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_168da15fe2774a0da5de57948f1af804.pdf?index=true
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_309804704aa8427dbe11a0056d2ce5f2.pdf?index=true
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_b0e33d047eec4669af1118fb4ad98a20.pdf?index=true
    • https://s3.amazonaws.com/megodipewukitoj/english_grammar_worksheet_for_class_6.pdf
    • https://s3.amazonaws.com/tonisefoteka/35849756660.pdf
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_8adaede0fc1c41a18ddf97b3ac8657a4.pdf?index=true
    • https://s3.amazonaws.com/jejulurowev/kundli_app_for_android.pdf
    • https://s3.amazonaws.com/wupuxus/excel_bedingte_formatierung_zeilen_kopieren.pdf
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_7979a49271854c568524567e5778fffa.pdf?index=true
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_da8e2cd8542d4c458898232fa9a45f2e.pdf?index=true
    • https://5a11eff3-0c7a-45dd-bb89-060d4d4d2060.filesusr.com/ugd/72216b_9401691c1f1e4c81acae101823ca175f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b0.bin
c2fcfbb6c2598fc22c432ae9ca3db43fdee4fc8c8c0bb706f612c2e2fc6db540		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 5412 bytes
font_01_sfnt_off0000fc0c.bin
cd76864a22dede6274b7112979d4660cfa9ced9a5541c15e7e95e3352abddf24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 11076 bytes

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