Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcf8ff16d3c2e0d…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 03:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: dbd63910f964e2b6230d04d742f047ce SHA-1: 012e4741946a5fb390eec31c12089d908264aaf2 SHA-256: fdcf8ff16d3c2e0d51494b01d1421d5b3526d7edd51946c5bba85e35f4097ee2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://fotoprint.lv/downloads/file/64198041920.pdf In PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/55349577411.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/wolopatez.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/48082364188.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/gekemubara.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/dorikenugusiverubexokunad.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/89def831941212f36b1ff33ce9d6a54b/xejewuzugelod.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/88332983778.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/50981321899.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631905394_1623e40718.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/87833642563.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/13522938413.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/karobutexajodomebutebo.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/vopogitedereb.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/zifovoxufozadov.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/lawegib.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/23750736338.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/25678867302.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/nulofegutadedesem.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/52799977213.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/51121436302.pdfIn PDF document text
    • http://chinazzjx.com/d/files/sexugopimasejitojamudo.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/figeniretulovelimolixowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+you+get+free+cod+points+on+call+of+duty+mobilePDF 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_off0000ad55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD55 11396 bytes
SHA-256: 679d2fe5a0c18910f8572f091dffc8476331f5fffbb41658afa28fc34d83f33f
font_01_sfnt_off0000c7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 14516 bytes
SHA-256: 89243ecc7cea89771224926ce97ac72d3e892163a8e49dee5aeb85cc6de11ac0