Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d4c94a28aeb997…

MALICIOUS

PDF

93.1 KB Created: 2021-03-23 18:39:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8a864681fa6669b79567acbfc6839cc7 SHA-1: 085f4323bd77b548f47707b2535d808dad74d53f SHA-256: 66d4c94a28aeb997a5412009de7b6e8255c88d291a0ab73866af0cd12491d914
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to obfuscate the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the 'link farm' heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=dd+national+application PDF link annotation
    • http://beremoter.online/m-audio_keystation_49_mk3_sizeqomgb.pdfIn PDF document text
    • https://wutejaguruloz.weebly.com/uploads/1/3/1/8/131871665/6233397.pdfIn PDF document text
    • http://leaninrzpd.site/sifudulemuzonukywgc0.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/62555275454.pdfIn PDF document text
    • http://tublitalia.fun/60225547586dx7k2.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/ziloxile.pdfIn PDF document text
    • https://takatika.weebly.com/uploads/1/3/4/6/134605824/7686589.pdfIn PDF document text
    • http://noksipals.online/netanekefdff5.pdfIn PDF document text
    • http://yoganchik.space/87183790121anszj.pdfIn PDF document text
    • http://blockhcain.host/webigoxuxomekorunutojop0i5v.pdfIn PDF document text
    • http://bbbbbbbbeeee.space/how_to_tune_up_a_riello_burnerssps4.pdfIn PDF document text
    • https://sinuvuliwazima.weebly.com/uploads/1/3/1/8/131871572/jakumobiminoj.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/aPeCJkS/62474063022.pdfIn PDF document text
    • http://vashobereg.com/795765135007m6po.pdfIn PDF document text
    • http://italylife.pro/the_binding_of_isaac_like_games_androidlnafm.pdfIn PDF document text
    • https://cdn.sqhk.co/senuziker/jcXty6T/80126590215.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c90564f6-cbd0-41a9-bb0a-0ca4662379b7/sutolokanojodefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7679844-5fef-4b49-9f1e-ebaa485b012d/anthony_de_mello_awareness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c08589c-eb63-4bc1-8fe7-f53e5352a62d/lobizarase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e2d899-26f2-4137-8dec-6f62ac473f68/nlt_catholic_bible_review.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_off00012e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E45 4792 bytes
SHA-256: 7d231c43887ad445d4e2bc27a0001300ccfc133f68adf141211c4e11476e6b00
font_01_sfnt_off00013ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAD 12044 bytes
SHA-256: 0ec57a53d53a3806bb70b52c988183a0cb0d7495b9c58740e33cec2030cd5ecf

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