Malicious PDF — malware analysis report

Static analysis result for SHA-256 7302b761f16db720…

MALICIOUS

PDF

71.5 KB Created: 2021-09-14 11:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9895fd0ecabbf38cd0fe521a3ea0a38 SHA-1: 7a2d63f5ce6b7facba32b93bee05ae046f20d6eb SHA-256: 7302b761f16db7202a4a85a57772e0d14a427f8a564964a11da7ed4c2ccebf5d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were extracted, the PDF structure and numerous external links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 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://laborke.ru/uplcv?utm_term=enjoy+enjami+mp3+song+download PDF link annotation
    • https://tannhatviet.vn/upload/files/livididinegadugadagifu.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fipujarizoxavuguxudanemal.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/55199540546.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/53291198919.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/93268452027.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/18731433326.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/gagibizid.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/51341398280.pdfIn PDF document text
    • http://duef.ru/public/file/zajakugazujokufasamufofav.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139e9bf5f170---zijaparojupenuzu.pdfIn PDF document text
    • http://melabo.com/upload/files/duvizik.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/vubikejon.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/dedakivixufovu.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/87780828240.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/10020579707.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210901223453.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/5287872996.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://logicamail.it/draft/media/81303319219.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/jitifuxarosekimujomafosek.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/kufokexa.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2581fb19065c8099cc861687c73972c1/tagetinorinuleleda.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/2746065483.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/96566091576.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/baluzikul.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/69636504920.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://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_off0000b64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64F 15844 bytes
SHA-256: 50942d3d0b3db5af1a97a5f527971bd4163bc9640c1972bee19ca81a3d4bf1ff
font_01_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 11024 bytes
SHA-256: 077a5f6ff062fc3e776db22f32ad6ae1764f9c3d86cc32de554dd6c97c40df3d