Malicious PDF — malware analysis report

Static analysis result for SHA-256 3605d5106d6cbc75…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 07:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7cce2196744e95488b8d731622964485 SHA-1: 06a5e1ed46abf25dbe3c31e1a34020ee06ec8a7b SHA-256: 3605d5106d6cbc758698f329d297e3b060d977311eac90381c9d3e56cc88a394
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_CALLBACK_LURE' indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams or refund-related phishing. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to host or link to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/76065922786.pdf In PDF document text
    • https://eco-translation.ca/upload/editor/file/fudaj.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/63126368348.pdfIn PDF document text
    • http://446888.top/userfiles/file/lakavuta.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/82877808980.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/dofurevuw.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/pojukuse.pdfIn PDF document text
    • https://kultmotor.hu/images/files/givatukozuva.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/dujasigokoliruganek.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/pemuwabeputi.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/77942020878.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f72624d5a---fokuranosam.pdfIn PDF document text
    • http://abwva.com/uploads/files/doxatururevoxakila.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/bujosogug.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gonupejavuviwuku.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/totobilukuvemopavovax.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613658d8494a4---pawuxa.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/38419549846.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/lobizamokezusonifagos.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/sukavepumim.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/74257407613.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/kalemisu.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/lifeguvoginozapesomabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+block+a+wifi+network+on+androidPDF 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_off0000d9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 17140 bytes
SHA-256: 99fedf7fe20858aa55e413f105294f7a83f97eda4ee416c6e351a2c33be1d5be
font_01_sfnt_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4F 10608 bytes
SHA-256: acf0d502b59e1dea39ad5a6a3df9c85d4828a1d954456bdc58dac02457ef2894