Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc6f556ee06f362c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 16:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a4776269cdbf04fe1ea0b4e63fa6e93 SHA-1: fa2635a3d5ff26a5836b9fa4cd7c9b82791bf378 SHA-256: cc6f556ee06f362cc63dffba16f7ebe635a9a7466c1cc4bde8009832722adc15
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback phishing lure, prompting users to call a phone number for a fake issue. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection suggest it's designed to deceive users into fraudulent interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mma-montessori.com/admin/ckfinder/userfiles/files/kirutilulerusegefofemo.pdf In PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/85411041784.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/74570633280.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/winozeg.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/72826019931.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/kigapidadasasu.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/76691875309.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/zujatiligofadonibetovene.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/dipovoninapimuw.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/peful.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/savodoseminetowu.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/ginevonuvabep.pdfIn PDF document text
    • https://tessuno.com/upload/files/6133f13309e48.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161440ab07d173---46553765678.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_232507.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0802f5f9400d15316ca5e1edf1fe5ed8/91137676574.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/1123979454.pdfIn PDF document text
    • http://brandorbit.in/userfiles/file/77954414395.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/10784284054.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/7996203833.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/nunadifikazifofupi.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/168679128.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/nikof.pdfIn PDF document text
    • http://knipia.com/userfiles/file/74900076838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=watch+my+life+as+a+zucchini+online+free+englishPDF 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_off0000b321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB321 15516 bytes
SHA-256: 879eeeccb5ef0bebe1471226e88f4e2e8b62f423e91f09f3a34aa175b6f503de
font_01_sfnt_off0000da72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF289 11052 bytes
SHA-256: fa12664bbc923a12ba1f7e1f4bef971f4edd438b86eb6f4e4f5bd5485b46f402