Malicious PDF — malware analysis report

Static analysis result for SHA-256 563ba6b2ea456960…

MALICIOUS

PDF

86.6 KB Created: 2021-02-28 23:50:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a19cce7a9639ecddb62778155f258686 SHA-1: cf5561467c10015a37b1d1a2baa93646e4d527cd SHA-256: 563ba6b2ea45696004fda922670c677f8d83eb0bf84800a0e5d65d26abc7ed56
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://pelibifir.ru/strik?utm_term=asus+rt-ac87u+router+manual PDF link annotation
    • https://cdn.sqhk.co/sadetujadufi/z6ibThg/81558219642.pdfIn PDF document text
    • http://mebets.xyz/interstellar_black_hole_renderingnko5o.pdfIn PDF document text
    • https://lusimijibujadex.weebly.com/uploads/1/3/4/6/134677052/9928798.pdfIn PDF document text
    • https://liwigudujonaj.weebly.com/uploads/1/3/5/3/135383521/5405478.pdfIn PDF document text
    • https://cdn.sqhk.co/fogobewataja/YZjfgjN/ranoxavebuneb.pdfIn PDF document text
    • https://gisudilepa.weebly.com/uploads/1/3/5/3/135346020/8348df62176794.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/581234.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/how_long_does_fossil_gen_4_battery_last.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/YijHUhb/89405875347.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/linking_verbs_worksheet_for_grade_1.pdfIn PDF document text
    • https://togezajotutev.weebly.com/uploads/1/3/0/8/130874352/3cd8c9c0118404.pdfIn PDF document text
    • https://femodamokej.weebly.com/uploads/1/3/4/5/134529999/jebagawuvined-digafagigilemi.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/widosinemiwimize.pdfIn PDF document text
    • https://senajadodum.weebly.com/uploads/1/3/1/3/131379015/tizifewigimujitogira.pdfIn PDF document text
    • https://rixexumig.weebly.com/uploads/1/3/2/6/132681576/luwazasaziw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/29864613947.pdfIn PDF document text
    • http://gikojutubosolu.epizy.com/vejewegafebeniw.pdfIn PDF document text
    • http://pagosunizuboroz.epizy.com/zizedunipap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 5240 bytes
SHA-256: 3924137de59ea3a07729380d45ecf9d0e0221a836ff553b885da02de8de05070
font_01_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 10912 bytes
SHA-256: e27d0eab5577b52fdff6a08d9588978d0e618053df965dd30b019731d58164e4
font_02_sfnt_off00013688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13688 16348 bytes
SHA-256: 44344d777475bc27302cf71c6ce9e96b5edcb3cf6b8673c7cacff1863add0d01

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