Malicious PDF — malware analysis report

Static analysis result for SHA-256 d353a5fc1ab5accf…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 20:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2be4305fa8e8b80f25460717a06a7504 SHA-1: a68f4bab4fce52094cd65c4c04a33a868bcb0155 SHA-256: d353a5fc1ab5accf593f20c72984cafc0656322354fb15e2d4ce3837cd77eb86
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tjjjsh.com/uploads/files/wavaxudedejotobip.pdf In PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/31126109718.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130cfb354507---21259456246.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/62822317974.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/roxekokapikuwotegawewomed.pdfIn PDF document text
    • http://vkts.se/userfiles/file/7089353509.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e19c921d---fojigizilokive.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/29890704777.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/63997311446.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/61281602257.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/1614980528.pdfIn PDF document text
    • http://vlajamo.cz/images/file/51614434020.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/73301807714.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/13551055000.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/duzemogikosixeliteniriz.pdfIn PDF document text
    • https://advik.net/userfiles/file/77279463403.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/wororozeliruvelosolixe.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/35577438956.pdfIn PDF document text
    • http://apicn.net/upload/files/36239858158.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/89667560218.pdfIn PDF document text
    • http://armanetti.com/images/niwozapexofaxis.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///gibufezegivad.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/xosol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kindle+paperwhite+4+manual+pdfPDF 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_off0000b5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E5 10732 bytes
SHA-256: f9d3824e761c81eb815ff1e5129b54a72203b8b84403586f6034604a76e2c8d1
font_01_sfnt_off0000ce58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE58 16272 bytes
SHA-256: baaccc8831a85e5f37cce9beeeb3b5c535431e623dd1227e1b530467077bb118
font_02_sfnt_off0000f7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1