Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a4aa5f8ed9d2892…

MALICIOUS

PDF

79.1 KB Created: 2021-03-04 00:43:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8862fdd18268d889b5c05f2ee48130f4 SHA-1: 23af6f368f451a5fb38f3c3f95bfa0a48b52bbce SHA-256: 0a4aa5f8ed9d28926a8fe5b669e48b888c2546604a382559f258e0472aa2fa86
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous suspicious URLs and the 'link farm' heuristic point towards a phishing lure designed to trick users into downloading software.

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://jacksth.ru/123?utm_term=arduino+ide+alternative+download PDF link annotation
    • http://afracheat9.xyz/99370376666rhvnw.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/jhgcUX1/maxisys_ultra_review.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/kurujixitotole_tisivapusavafu_zupipuxexax.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/93369271948.pdfIn PDF document text
    • http://springwin.space/xonekugomefovaboxdqxxo.pdfIn PDF document text
    • http://itrom.fun/weniguwefowibekivatavclp2d.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisezepemu/jfhcgip/tetris_ultimate_steam_key.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/aggdjei/63767985009.pdfIn PDF document text
    • http://com-copyrighit.com/lafozatoruzavul52uax.pdfIn PDF document text
    • https://cdn.sqhk.co/nujidegowupi/ridIHjf/tisiwepezoren.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wepirizifomonij.epizy.com/avery_a4_labels_4_per_sheet_template.pdfIn PDF document text
    • http://rodixotezogas.rf.gd/43978796076.pdfIn PDF document text
    • http://pefimubis.myartsonline.com/difference_between_jbl_flip_5_and_charge_4.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/12981712625.pdfIn PDF document text
    • http://rupufak.epizy.com/tirarirosujaje.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/bavonajijozagavivawisi.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/children_s_video_songs_tamil_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/sivajasubotefuxi.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_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 4784 bytes
SHA-256: aa83fe9c47285764b49324572dbb87a0c3a8ae9a2c11dcab938501bd0c297140
font_01_sfnt_off00010983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 11032 bytes
SHA-256: 6b6bfb2c73ebbe37d10829b70eb264674138ce7a895c63f3ed93b4ae50f36c52

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