Malicious PDF — malware analysis report

Static analysis result for SHA-256 d949df1186da0958…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 01:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 43aa660fcf30201082229b44d5b2b38a SHA-1: 589a79adc159c1401b39506157e304fec32812f7 SHA-256: d949df1186da0958be828465c51f2eb43a64eaba9c1410536160f2a78a60e53b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is used to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is part of a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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://garglob.ru/uplcv?utm_term=the+power+of+habit+chapter+6+summary PDF link annotation
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/81237353071.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/4689585908.pdfIn PDF document text
    • https://tsegypt.com/file/43975130653.pdfIn PDF document text
    • http://scarpatti.com/files/ketorodexakasani.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210903045605_2pghlh.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/zovesujokalidiled.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/1630023474.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/58720248468.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/burapevuriwobilokerexi.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/87467576275.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/62716702810.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/bufudifuvovedekogoxux.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/6459076395.pdfIn PDF document text
    • https://seger.cz/userfiles/file/73620931607.pdfIn PDF document text
    • http://lawngo.net/fckfiles/wigifotiraso.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109200445578353.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7d7feb0890946ea6c9f96f4ca5758d22/nalikujujilif.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/5273701533.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/75882912690.pdfIn PDF document text
    • https://tele-video.ru/upload/files/bemabatetotudodakamupigo.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/novunulibojana.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/xiramuba.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/rusifekesulusipuredeki.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/34608872476.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_off0000aec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC1 15000 bytes
SHA-256: 7d864d130884e93c81b4116f7b0f38f3f4809a30ae667aa3725962c2150eefc2
font_01_sfnt_off0000d444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5B 11168 bytes
SHA-256: 3dd10a3430add1a15ca828386cb6a908aec26cf05066c84a69bdbccc5265f3d9