Malicious PDF — malware analysis report

Static analysis result for SHA-256 10132334f1b7037a…

MALICIOUS

PDF

73.3 KB Created: 2021-09-20 06:58:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e24c71bc88db376a7cbb0d3f39d84c71 SHA-1: 487da6dc54058df220181c79e0d4a4318dfdbb4d SHA-256: 10132334f1b7037ab71711666c1ab480406d8b809be7f9e8c1ad2eb9952a9aa8
146 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with a medium-severity heuristic identifying one pointing to a raw IP address, indicating a potential attempt to host malicious content or redirect users. The document body is heavily obfuscated, but the presence of multiple links suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://newbusan.net/FileData/ckfinder/files/20210904_C662D2AB40FF9616.pdf In PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/90354086247.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/69546989816.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161389dce99669---81087615208.pdfIn PDF document text
    • https://nexapos.com/upload/files/rofoxopaxi.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/wiranuxutagew.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/47912408107.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/wigiguzowofugosefarurod.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/dutin.pdfIn PDF document text
    • http://ajitcoatings.com/uploads/muwajonukud.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/53080453592.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091704493973499.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/92381436785.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/rebewep.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/38119925412.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca818613aa---faxigafuxi.pdfPDF link annotation
    • https://j26clean.com/upload/files/81393635310.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/62577292446.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/95449905931.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/83056898620.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/464d0fa8cad21727583d627cb0038a66/belinexubutuxaradawi.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/sepukowi.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/kokew.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/23506593072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gta+v+online+free+for+pcPDF 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_off0000bf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0C 15888 bytes
SHA-256: 3d596cdec8618e597270797bc655e1af63e58510400b47ac09246cb5d0a672eb
font_01_sfnt_off0000e7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC8 10408 bytes
SHA-256: eab4c72b72b9c41a31ec4fee4234da29f2d8db4bfa0d365e753bbc9c458c3857