Malicious PDF — malware analysis report

Static analysis result for SHA-256 2911556edc8cc02e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-15 20:00:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab889a83ef57c45ed3a8708347ecd53d SHA-1: ef11492551d46e358eddbee8545dd19060b5ca8c SHA-256: 2911556edc8cc02e22dd037075ad342a0802ca4fb6451bfb3dbb4ba0b4296333
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://archism.ru/uplcv?utm_term=indian+idol+all+season+winner+list PDF link annotation
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48fc71a39---93450259981.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/77713487635.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/rawabuwixifipu.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/18330629106.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109111418482628.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/1602094216.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/93490935982.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/53235817239.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/40543408409.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/70965621459.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/zefixaduxoroxegopape.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/18861787205.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/99498827569.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210904235800.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/99916883201.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/rurikonuwajekolob.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/gugutatasosatekamiki.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/96584707584.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/luwefujirebikofux.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/39276230940.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/32647849064.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/fofuwufasapulapofetoruj.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/tewugenewefasuke.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/90577540855.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/zitaxofofilof.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/20682979752.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/rudanagetafe.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613488096a8c6---58666043022.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_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 15196 bytes
SHA-256: 31d822244be6568bec77064bb67eb776e78262af701ffc3575976fd63672fc8f
font_01_sfnt_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 10280 bytes
SHA-256: 6e578a57c9e4d89bf5e98010e2f48ab952868d9f5d0beae0919613899ae9049d

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