Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22019a431133a1f…

MALICIOUS

PDF

75.9 KB Created: 2021-09-23 21:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fc345deb1f35b2f6fa0b8f2889e82c68 SHA-1: 1e76e316aba1ded974f3f8f82474a8061b19c774 SHA-256: d22019a431133a1fc68f4db5762e34dc6e21b79c59381c6a5235a2f5676a8ccf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to suspicious domains, and is identified as a link farm designed to host other PDF files. This suggests the primary purpose is to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://pincailight.com/zk/UploadFile/file/2021090507495573499.pdf In PDF document text
    • https://grouptm2.com/contents/files/risarebet.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zukegidolafogiliv.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210923120847.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb5b7ae225---61401875939.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/94d5b1c9c7488f971890c078e9b7ba1b/42173054855.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/poxom.pdfIn PDF document text
    • http://khocabien.com/uploads/files/79126240514.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/dafagosowimirevus.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/5682143468.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/91894694285.pdfIn PDF document text
    • http://muszempilla.com/files/file/lidefigux.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/vefesijotiruloladobabera.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/vomujulefesa.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/vewulogifitumosiwal.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1632181634.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/baxukibexan.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/47937415114.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/7044990291.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/99064291291.pdfIn PDF document text
    • http://air-con.ru/upload/files/48573939262.pdfIn PDF document text
    • http://webursitet.org/Files/file/35655249399.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210919_025007.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/31304038219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=snow+moto+racing+freedomPDF 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_off0000c21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 10768 bytes
SHA-256: 9a32afd92c7975c08b94d1eba1647000bca72210ae079989cd356e7430661c4b
font_02_sfnt_off0000f2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D3 18236 bytes
SHA-256: dfa0f03365bfc7486fdf3030770d2b081895efa08af85927578e33b49b90c468