Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f9194e080eeca6…

MALICIOUS

PDF

81.2 KB Created: 2021-05-11 05:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 840a9602cbe363de77b1426a2ba57930 SHA-1: 85a17b2e9cb00251586dc38e6ecb354ea22992aa SHA-256: 23f9194e080eeca6f3816c34b402a3316d6554348e384dcfbb8ef744bf123c25
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=is+garmin+520+plus+worth+it PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371267/normal_6003795bc8d68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_60183ce08388e.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/9ichihf/47076636356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_6047c679389eb.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/hbnLggi/vurotaj.pdfIn PDF document text
    • https://pebizadovabunal.weebly.com/uploads/1/3/4/7/134711288/4703965.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/S76Wmge/54212571983.pdfIn PDF document text
    • https://koxepaje.weebly.com/uploads/1/3/5/3/135350813/nexam_komusepukulim_gaponegefat_rujedokidevigux.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/eW2Djhz/racer_underground_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/lokutibu/dhbihhl/star_battle_puzzle_tips.pdfIn PDF document text
    • https://devuzagobeli.weebly.com/uploads/1/3/4/4/134431767/ab09e3c987a.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/mhg4hbE/15063933520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408593/normal_60676d75dd2f1.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/fotojipifuzitul/3020873695.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/47080177772.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/free_tv_guide_nz.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/29226249498.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/psy_music_bhole_baba_ka_song.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/tabla_de_densidad_del_agua.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/xopaj.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_off0000ffdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 5660 bytes
SHA-256: 4a616a0cb5276c7c31567651f69a2bab408454422aa68a5dd5be816a92f2bbd4
font_01_sfnt_off0001130b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 10740 bytes
SHA-256: 5df4b814a830b9762f48592593cca2e353dec86e45cf700ec19caeab6085ece3

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