Malicious PDF — malware analysis report

Static analysis result for SHA-256 9371ccc4d5e0d8b1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-10 23:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fd41d507582c98213135fc8cfaa17e6 SHA-1: 5af6ce1716d0d776ec1c8bb5c8f0da37dbb6fd5b SHA-256: 9371ccc4d5e0d8b11d97c46986562ee85c2ec6a762dcae05e5498cffa6be1f19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic firings reveal a large number of embedded external URIs and a link farm structure, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=the+elizabethan+age+shakespeare PDF link annotation
    • http://skupka23.ru/upload/m/xuwuvebafimejisuwobuwedel.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/97764739296.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/69461233902.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631235172.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/32077245933.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/kupolixomasevobejanavigas.pdfIn PDF document text
    • http://teplospectr.ru/images/files/81322853654.pdfIn PDF document text
    • http://gabortech.com/admin/file/gofugalufosesep.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/buwajusa.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/tajekabi.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/67349982293.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/65722942921.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/40101212156.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135cef0eedce---sironavunoro.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/jamajarasugunorijobunu.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/51632160666.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/lajofa.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/67487891908.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/taxuvifabavesuzoreroz.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/majudugeragunidala.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/61894701266.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/93481b350b91ba1ff9cf304df7e4c46e/disetimozafowexitiba.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_off0000ea08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA08 18104 bytes
SHA-256: 6cabc196012c26cf02f80405870b939b1cd87676be957cc9688d8ecc62d8f3c0
font_01_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 10664 bytes
SHA-256: dcfef60f15b8e782cacaf47bba6aa2fe6a3d77b57ba7c098e3da90988bf39308
font_02_sfnt_off00013140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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