Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a2d2fb093d4e57…

MALICIOUS

PDF

79.0 KB Created: 2021-09-18 13:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ef3c5611ea8015d0b6261289596d67e SHA-1: 47c6c8088d8eb27c8cfe0d4421585a62ec815a74 SHA-256: 12a2d2fb093d4e57f7d984021fcbae15c56a42ef47e18949f02b86a48660a5ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting it acts as a lure or redirector. The PDF SEO Disposable Link Farm heuristic further supports this, indicating a link farm on disposable hosting, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://urjabatteries.in/userfiles/file/28255091887.pdf In PDF document text
    • http://hadt.vn/upload/files/mikasimixebuzafifot.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/45960763158.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/58064524646.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e15be4d84---59673527516.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a468aac9619064676bb4f3492a34a02/25842533761.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/siziwefa.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/lezujobizutewefojebemi.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/1224573086.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/sonafujeg.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/914829645.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/vuziwime.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/92713518572.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/kodurivogetibarusonivako.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/46288405193.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/belefaxaxarokujusopareg.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/6609232014.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/82785192650.pdfIn PDF document text
    • http://irollee.com/userfiles/file/81812819453.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/41866842962.pdfIn PDF document text
    • http://zaiger.ru/img/file/gitafusururesikenupupag.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/wawovirazovonelav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=slitherio+unblocked+gamesPDF link annotation
    • 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_off0000d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 17216 bytes
SHA-256: 1f1cb5519a45ac12c9cec822b51069697330d5f3f9130df06d18675ef4c0c661
font_02_sfnt_off000114ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EF 11224 bytes
SHA-256: 4a8814e34248db94269e2fa785823126da8ec4c70866e2ff55ccfe2ca2990bec

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