Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f0f8b45279b375…

MALICIOUS

PDF

66.8 KB Created: 2021-10-01 11:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d75523eb2c7640d97b392802edd45b2b SHA-1: b39522cd4809e2245d722915be6505f779dbe4ce SHA-256: 03f0f8b45279b37500256188ad1022bcc1edb22b4aef740934822c46544c6a33
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/66572738820.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326f2a9a304---94630392370.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/gewanuroja.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/jefonukewawim.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/93019113381.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/35138429312.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/xatepeluxopud.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/bujugawumijubexasiwozaki.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/29968644199.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/50919956329.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/99660084873.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/58704392136.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16156bd632fe40---binifusikaxod.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/95484174531.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/54412629794.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/15568050105.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/94414619707.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/44309397775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=a+teacher+putlockerPDF 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_off0000a768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA768 15120 bytes
SHA-256: 5b4f3f82a2e88379ded2deefbf6ce2722392f09865122f7e59994e977cedaa67
font_01_sfnt_off0000cdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 10280 bytes
SHA-256: b59ce27bc8b010e38b54c1c7d0b381abe710fc6dbfb5076353cf7894f6458ce7

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