Malicious PDF — malware analysis report

Static analysis result for SHA-256 28848adcfc02b5f9…

MALICIOUS

PDF

101.7 KB Created: 2021-09-21 07:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2658657bdbeb033b6ef3b88e48a38382 SHA-1: b37748d7cb8f8700c78cf5e763efeac66e194c69 SHA-256: 28848adcfc02b5f9a7ae755c5575c6ac6e312fb6868497d0fa19bc42675f5a44
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/sojoduzenexofetag.pdf In PDF document text
    • https://hamasataccessories.com/userfiles/files/38506700659.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/fofukiwalupedelogukifu.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/milixu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/98441b0598418cdbb05e4189ea5fe742/nexunupiv.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/jajofogapevakevag.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/fapevarixitom.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/fuxirebefaxulog.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/39075662756.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/14359738923.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/72463227673.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/gamoruxugime.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/mamekusofiwuz.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/56587418356.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/13741802218.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/78445950182.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/sokivujeguzom.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/jibuwuwojililar.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/46687579034.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/xeligijasubukifewufiwekof.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/torobuzeziwelema.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cab96430a---11181541751.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/dufuxogavipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=change+the+time+on+my+phonePDF 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_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 10532 bytes
SHA-256: 62338bf9b25f16f304de9c0d45893953ddd7b4519da541f2b4148a30e58eaf8e
font_01_sfnt_off000141a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A5 18320 bytes
SHA-256: b44f5e337903d75b10bc8071ced126c499311b466d67afd2d5b1f4a5d3b136b1
font_02_sfnt_off0001713c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1713C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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