Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df50277fc6c5a0f…

MALICIOUS

PDF

88.7 KB Created: 2021-09-13 22:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96cc0f190050d915897c401d94c019cf SHA-1: 3545e7657b062ec7b2db1be804aad34bfb2bc04b SHA-256: 2df50277fc6c5a0f161492c4a7f717a4f0e4748ac4e6ac8794410536c6fbbfdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for distributing phishing content or malware. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to malicious sites.

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 https://synerhu.ru/uplcv?utm_term=year+11+modern+history+source+analysis PDF link annotation
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/97414917529be696a693faf9880e2fa7/turonuweredufu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/wevor.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306f4b10710---lonijuwavubiduru.pdfIn PDF document text
    • https://windsbs.biz/files/file/kegefub.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/zorofefodezufuxuwenebiro.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/99334521078.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/xojokofobugemojosodaperu.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/398170770.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/55057978345.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xikawuzineleriwifune.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/03/36239392618.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/59871778587.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/40666433810.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/84936092177.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/semolora.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210906062705.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/xixuwisuvenozuzureka.pdfIn PDF document text
    • http://hbaoge.com/upload/files/65090983707.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/sumematat.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109052258094564.pdfIn PDF document text
    • https://kimcert.org/E/file/kezalepopozulubut.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/62940099695.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210906010535.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/70947168697.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/raduwor.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_off0000f35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35A 10884 bytes
SHA-256: cc1d19a9c484efd03f5bf95e55f4be16bf02c60e3238ebfa6b2308f5fc1a6c52
font_01_sfnt_off00010c62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12474 18808 bytes
SHA-256: cddf2108cdc7b46a28a81c376e56a74316c2c66f9369d03813d81238d505ccbd