Malicious PDF — malware analysis report

Static analysis result for SHA-256 921b7cfd4369452a…

MALICIOUS

PDF

68.5 KB Created: 2021-10-03 01:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ccbac560d45ebb45db53654757a590c6 SHA-1: a423b8dccc4a7a4d1da961a73d285212c759b2de SHA-256: 921b7cfd4369452acab7df17197da64d67ed6df9fe57c603e88fcc77204b2ebf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://exim5.hu/_user/file/98612991736.pdf In PDF document text
    • https://total-sport.pl/img/upload/files/xiwavaxarevot.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/vulolirelom.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/fisemikivawisevofod.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/92347944509.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/19055698786.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/larimudobododepe.pdfIn PDF document text
    • http://szm.hu/userfiles/file/25177769705.pdfIn PDF document text
    • https://cedd.saglik-network.org/uploads/file/32306548888.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/41968010599.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/180bd84c3258658fdb27a4f4d357ec5e/vinanutozuxafiso.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/64244641762.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/22258089075.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/57808068073.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/78250297754.pdfIn PDF document text
    • http://no1sushinroll.com/uploads/files/75034015650.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/94051002066.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/49287560248.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/bokaxodadodob.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/mutelusawunenunaxasedip.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/91743456126.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e9f43ca8fa9313106e25ade4fa3533aa/faredusap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=coinsurance+percentage+meaningPDF 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_off0000ad2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 15324 bytes
SHA-256: 82506903a50077accea4c243760f10c48f063a125c6cda09727eeda607feb288
font_02_sfnt_off0000ec12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC12 10804 bytes
SHA-256: f04fb647eda0468166dbabd46e937a50340dfd60b7abe682772faa2e0dc846e5

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