Malicious PDF — malware analysis report

Static analysis result for SHA-256 164eb787c8c77939…

MALICIOUS

PDF

87.8 KB Created: 2021-10-09 07:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 34f204108d3e0a8046a6b0217565e5fd SHA-1: 1079a3926bc6521894ae45e3754444a43a92f8a5 SHA-256: 164eb787c8c77939f4c6bd787750d29ad9f4a42bdc99c14036dd4f17b8d2c453
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URIs were found, with one directly linking to an IP address, suggesting a link farm or redirection scheme to host malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://margheritango.it/userfiles/file/zidipiluxivon.pdf In PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/5i73ic9imtjkt81gek1tnd077b/vezubukegazewim.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/gunuzofujivubegama.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/pajid.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/11734961390.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109160134558479.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/xobekoberuvavujasak.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/libotuk.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/pavet.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/vasepurubon.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/82783446538.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/77425049036.pdfIn PDF document text
    • http://robbes.nl/media/files/78022537874.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5643c1173aa3a82352686177852177ef/87981939144.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/redidawojesovikuri.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/tuxalawajamez.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/dopejabexat.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/161505f39e9882---xedikozoxiganumigejebajop.pdfPDF link annotation
    • http://meghdoothsuzuki.com/uploads/62490505349.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/74973096883.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/kagituveludafisoxevikon.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9d855ea71---mukikedepitupat.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/junuramefawidatulel.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/76512938753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+long+does+chicken+last+frozenPDF 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_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FF 20132 bytes
SHA-256: 962b3cf4c91e3f7f2a145ed254bf9095986b20ef5229fa8fea1ef19757472fb5
font_02_sfnt_off0001386c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386C 10984 bytes
SHA-256: 905b046abe5dd913859adeb0e39e56fdf83038900102f9e73732a62570277623