Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28b0aabde994fdd…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 16:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 706aa88f52d0e225eeb69aa352abc88b SHA-1: 465f5e99bddd765fd4379643883fe5527f09ef83 SHA-256: f28b0aabde994fdd889fc4a7b4558a41b894dfe1dd08c88ddf015e625140c389
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a single image and a clickable action that redirects to external URLs, a common tactic for tricking users into visiting malicious sites. The presence of numerous embedded URLs, many pointing to disposable domains, further supports this assessment. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/62753343855.pdf In PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/vikajufipatoxezupem.pdfIn PDF document text
    • http://apvn.info/userfiles/file/21040491207.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210913161905.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/mapajetuwawub.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/20808078652.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/burunobenoxoxumi.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/20937777151.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/deboluwodogofuzazupokip.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/bovakobemotur.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/vujozise.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/93873768217.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/63c3bddb4ac76d48af623f1a866c2988/36909157368.pdfIn PDF document text
    • http://lex.tj/img/file/selolupilubatofu.pdfIn PDF document text
    • https://eclearusa.com/images/file/rirukupafogoz.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/bizovinanipa.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/17703691133.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130a49c65724---walodujewomobamopitajopuj.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210925091104136.pdfIn PDF document text
    • https://hoavily.com/uploads/files/62443904216.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/legipinulopegur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+paid+games+for+free+iosPDF 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_off0000af16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF16 14360 bytes
SHA-256: 38c6e04bdf986f820d20bf6d864d0e048f78773088fd32bae7024f0cca0b1456
font_01_sfnt_off0000d30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 10768 bytes
SHA-256: 2c77535f13bd7a5eb7d59e9b4e1e7389a0069f5c2c583d2d8981df262465ae26