Malicious PDF — malware analysis report

Static analysis result for SHA-256 1155f63da05da4a4…

MALICIOUS

PDF

79.1 KB Created: 2021-04-08 05:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c4e73e3f80a38c63d4d2078679609b36 SHA-1: b0b74158301e591e84b2b567ff92e64acbfdc899 SHA-256: 1155f63da05da4a4189629467dc30c12cb30f945c873e6d191966f2a9b087506
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a technique often used for SEO poisoning or to direct users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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+install+car+seat+base+with+seat+belt PDF link annotation
    • https://guwagigiruf.weebly.com/uploads/1/3/5/3/135303004/ziranotadawupemepon.pdfIn PDF document text
    • https://vowimodinin.weebly.com/uploads/1/3/4/5/134599446/gidojepi.pdfIn PDF document text
    • http://20970907.net/lewuvugm00hq.pdfIn PDF document text
    • http://spain50off.info/minecraft_game_unblocked05pyb.pdfIn PDF document text
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/9995610.pdfIn PDF document text
    • https://fitabidik.weebly.com/uploads/1/3/0/7/130776693/filujiweguxomiz_kakaja.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/wazedematoridids54fh.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/paduzebiwusu.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/wokosozimovobaxaluto.pdfIn PDF document text
    • https://wolaserirefuf.weebly.com/uploads/1/3/1/6/131637046/vowepatigil.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/riridetukiri_xazamida_dejiloxo_difuvuju.pdfIn PDF document text
    • https://gigatadozewat.weebly.com/uploads/1/3/1/6/131606492/edd02614898.pdfIn PDF document text
    • https://xidiziwuzubiwon.weebly.com/uploads/1/3/4/6/134653180/4fa39515e5.pdfIn PDF document text
    • http://polnews.xyz/photosynthesis_virtual_labs_answer_kgxs4b.pdfIn PDF document text
    • http://smeshnoykir.space/68736231018ekqu2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/xexapomeluxivazoxonut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0291876f-bcda-4d4c-8569-052ae4b7e64d/rotabadomefuxomaxuta.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/20620501165.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b04515-3d09-4172-b348-94ec82b31e8a/batuketazisubixojomipiv.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/51717218974.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/bruce_lee_video_songs_hd_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/jujupobipovijudol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb4db0aa-3b3c-43b2-9af2-3e3c6266ab24/69880252007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e68bd39-ec86-477e-ac14-fc5995d4faa5/41267428593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb84359-badb-4a8c-9c21-03200acf6878/nz_law_dictionary_online.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_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 5080 bytes
SHA-256: 7328b0e1bef197f29083dd2b3009a0c7300567a2d1729a6c3d6f7e15ab4e0f89
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 10524 bytes
SHA-256: e8ca6e8b23b455b96ac1c12e8125cc677ad17db8efed70aefed9e91d9bd34733

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