Malicious PDF — malware analysis report

Static analysis result for SHA-256 5330a29b0e3c62ef…

MALICIOUS

PDF

75.2 KB Created: 2021-02-27 17:08:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b7c7d0ce6ecd024b0ebc51cbb25fa38e SHA-1: 9d4b84b3176ef44b5882d943f85272dafcb6da79 SHA-256: 5330a29b0e3c62effc85cc3f5e68c54ca021da54bbe7127d8d7ea7cb70df5cb9
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of multiple external links and the PDF structure itself are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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/award?keyword=volume+of+a+rectangular+pyramid+worksheet+pdf PDF link annotation
    • https://cdn.sqhk.co/verexoleki/jigihjg/tiktok_video_downloader_no_watermark.pdfIn PDF document text
    • https://wotuvinuvokotar.weebly.com/uploads/1/3/5/3/135330473/6962870.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/zubokuwizozisa.pdfIn PDF document text
    • https://cdn.sqhk.co/runetonorox/hfiaCjb/wheel_size_guide_mountain_bike.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/ehhzkJL/drag_queen_death_drop_from_bus.pdfIn PDF document text
    • https://zitidimesefe.weebly.com/uploads/1/3/1/6/131606065/4622636.pdfIn PDF document text
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/72c2f1068247a8.pdfIn PDF document text
    • https://zijedizadof.weebly.com/uploads/1/3/4/6/134692085/pilevavag_neraworara.pdfIn PDF document text
    • https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/468dfc3.pdfIn PDF document text
    • https://vizokajobekaxa.weebly.com/uploads/1/3/0/9/130969885/tikuk-tedefotapeko.pdfIn PDF document text
    • https://jojeditisiteso.weebly.com/uploads/1/3/1/6/131606373/jetukejijus.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/gzjjuhc/marshmello_helmet_diy.pdfIn PDF document text
    • https://pivakezajategag.weebly.com/uploads/1/3/4/6/134605748/bugazijap_zuwog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejamezi.rf.gd/how_to_calculate_standard_normal_distribution_without_table.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/27441632389.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/dikoromomejebi.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/talolaz.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/nerd_glasses_vector_free.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_off0000e9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D8 5792 bytes
SHA-256: 339293bc1b0559966c3d558986271e28edb85542b116ae33d93045033cae201f
font_01_sfnt_off0000fd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 9824 bytes
SHA-256: c16289caea3530581e0c5c73b8c2b2c988f23de878fe6d4911ed7157b51f7465

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