Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c16e6bfe3522f3…

MALICIOUS

PDF

77.2 KB Created: 2021-03-01 01:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a28284325876366d87738a4081c92cc SHA-1: cceb3287bb06e1a32706a7b7ccf83943bb449f7b SHA-256: b5c16e6bfe3522f3319d53dacd283904022c80f89629b644a60adb5baff71c82
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nipisod.ru/strik?utm_term=how+to+use+left+formula+in+excel+for+date PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd2de46f2827.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/positive_affirmations_quotesxkol1.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/10e8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5fd2dfe564008.pdfIn PDF document text
    • https://vajubepodeno.weebly.com/uploads/1/3/0/7/130776779/8419069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_6026ddb5d1a0b.pdfIn PDF document text
    • http://nuveclovet.xyz/41593872025427hv.pdfIn PDF document text
    • http://wonitudigugejut.iblogger.org/fijilasiwenafa.pdfIn PDF document text
    • http://kukukoboda.22web.org/49871222962.pdfIn PDF document text
    • http://busivel.xyz/group_company_website_template8d26f.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/avengers_endgame_new_poster_hd.pdfIn PDF document text
    • http://gogadozuxigode.iblogger.org/additional_child_tax_credit_form_8812.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.website/boregewuzhsy1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zalaxorenisev.epizy.com/51937263006.pdfIn PDF document text
    • http://pibixokemur.rf.gd/kanorefebevagivoxetu.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/boohooman_size_guide_jackets.pdfIn PDF document text
    • http://garapaf.epizy.com/grade_6_math_combining_like_terms_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/arya_malayalam_movie_hd_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/40163754560.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/14961350982.pdfIn PDF document text
    • http://rofamotitasijud.rf.gd/44523660856.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/angular_templateref_void.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00C 5288 bytes
SHA-256: 18694b9ba3b92056c558c5338fe0e7d1b09596ecea1692f13e86e4e2b5a837cb
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 10748 bytes
SHA-256: fd3367952916d2cea6fb004c4eb1302029980d67a33aed6a13163bb3c7f610d5

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