Malicious PDF — malware analysis report

Static analysis result for SHA-256 3895c6df95803a23…

MALICIOUS

PDF

67.6 KB Created: 2021-09-09 20:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 175902c46928ac024e70391d54d308bf SHA-1: 4fdc731a835ba3071dc108b2310fb99d92eaa1cc SHA-256: 3895c6df95803a23cbcff74872b4e95d3044e46707912fc1354b2d99ed9d08d3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing lure due to its image-only nature and embedded clickable link, a common tactic to redirect users to malicious websites. The heuristic 'PDF_IMAGE_LURE' strongly suggests this intent. The numerous external URIs, many hosted on disposable domains, further support the phishing or malware distribution vector. Although no scripts were explicitly extracted, the PDF structure itself can contain JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://philabc.ru/uplcv?utm_term=employee+motivation+and+job+satisfaction+pdf PDF link annotation
    • http://krajinar.cz/soubory/files/23075397328.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/86861568351.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109050221232004.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f56f81a7d---nujovet.pdfIn PDF document text
    • https://best-label.com/upload/files/73874532021.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/zomalavijepini.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/rigunejatasiziluxil.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/tiwaje.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/tovutefeminesed.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/58045649183.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/xowejavufoduwagoxib.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/lenuxugizawibaji.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/bawaxozapulexemerir.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/98830833827.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/88291689243.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/9f9761c506020e318f7c9a6a2a44d92a/jesujavib.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/tewebovulupujar.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/21400531291.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/21809633468.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/15779612970.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/72080183212.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/270798363.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_off0000ad45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD45 11116 bytes
SHA-256: 6a71d4c61bcb32fd45e45953560041505c2511340bf627b46c7bbfbf59c6afe6
font_01_sfnt_off0000c6f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 13960 bytes
SHA-256: b7231c6beaf644af118735ee43c66b3054be5f1aeb1dba84cab3e8bc8dc0733a