Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d51000024b11e64…

MALICIOUS

PDF

74.8 KB Created: 2021-09-27 18:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 89edc7e10a5dd7f195a48024eb03d492 SHA-1: 6557045d6a2d20a3cd87eeeb7d4b4e4298eb80ac SHA-256: 5d51000024b11e6481ce5ba87fc037d4da17981f5325e3c45667ae9532d7d63c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The 'SE_CALLBACK_LURE' heuristic strongly suggests the document's content is designed to trick the user into making a phone call, likely for a scam. The ML classifier and ClamAV detection further support its malicious nature, indicating it's a phishing or trojanized PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/78939f4f7c89cca817215d50ff50ad14/rajig.pdf In PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/73499380226.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/lakijigibepazegakugivit.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/kadujef.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/96928058921.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/43128038439.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/38416445756.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/77907754115.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/86292195645.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/68735792586.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/58343288900.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021924319541249.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/xisuwesax.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/50419689796.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/76513246189.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/wolulejuxupuf.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/mufatotemotulo.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/8543779597.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/48484338470.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/26247588774.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/jidibafuxosejiwanakufar.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/10679257169.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/13670958788.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/muzipukajudegewoweka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=basic+electronics+solved+problems+pdfPDF 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_off0000bab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB5 18636 bytes
SHA-256: aa8fa01b70211e3c5872932f60c544523628628f3b42359d4b3e801bf64f79eb
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 11040 bytes
SHA-256: ff1ccc9e3153a1e2167dd4a136e6b08f080643e007b4137aab475af9262179eb
font_02_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1