Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a61d699a75b09b5…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 22:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d01dd7df42d8f53726b28eb3da92418a SHA-1: 3cd411a891643f7e374ef410f36237063552f416 SHA-256: 1a61d699a75b09b573f6ce7ee73326e6b29a6f0b6f1c441f6243fb43ef28cc19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with one specifically noted as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were extracted, the presence of many external links points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://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

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