Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08aef557cf66721…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 18:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b16cee3ec16b371effa9307dc3a2fd3 SHA-1: eca674ec531f72dd067a5a491c72f5f6009fd476 SHA-256: b08aef557cf667213718b2d7aedb1683f126b41836aa28310318ede152a6c21a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. ClamAV and ML classifiers flagged this as malicious, specifically as a phishing trojan. The embedded JavaScript and numerous links suggest an attempt to redirect the user to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • 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.
  • 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://queure.ru/uplcv?utm_term=movie+creator+apk PDF link annotation
    • http://botosani.ro/img/uploads/file/gifutet.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/97274621216.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/40019989558.pdfIn PDF document text
    • http://houselandia.ru/files/limogomakibevudexomevo.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109101533038409.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/46693698868.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/22117689004.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/majivokozaxawuwubovadik.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/xupibus.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/29401914341.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/ferixozosigitegivesax.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/87281606714.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/surekidebumonexamuxa.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161409be11a729---10693658308.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/70631389724.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302fc3192bf---80951381470.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/88395807975.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/tewivekiwopuvuvewu.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/97540771708.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/pewiranidirarisujovulodoj.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/jubisewakinixope.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/kosup.pdfIn PDF document text
    • 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_off0000cad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 10200 bytes
SHA-256: 9216c9595d2a56d8e807ad4b7055192805c04f359a072fdcce5dcf966b49c92f
font_01_sfnt_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 18680 bytes
SHA-256: e7576277747fadbb669aaf06b7b924236a0e3473dcca0fddf1be201bd9f29d38
font_02_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.