Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a56d027c552f44f…

MALICIOUS

PDF

69.0 KB Created: 2021-09-26 03:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18cc99c36097738c28567992efc4ec66 SHA-1: 784798d45f95af84bb8c7d258c162f4d6b9f35e7 SHA-256: 0a56d027c552f44fec94ee7e1f018d3e64d2bf44311134e6444feec60f492453
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding a large number of URLs, many of which point to potentially malicious PDF files. While no scripts were directly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://makinsushi.com/uploads/files/nofiwojorisosuvip.pdf In PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/zanezuminule.pdfIn PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/jubiberedifem.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/fijolinalejijijuxinonen.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/75732123857.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/79997238214.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/46087625085.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16140027dc4ea5---ludinoxunidesemejate.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/lafupowezekumolasesalane.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/28819186555.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/xasomekodimokedol.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/fojukofuniju.pdfIn PDF document text
    • https://rm-parketi.si/uploads/zizigelik.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210919180538.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/tenaven.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16149340915d2e---nugesaguwavimumeneboso.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/26988006529.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/8715868165.pdfIn PDF document text
    • http://safetruck.gr/images/file/16021052100.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/61318170662.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/matumolasofixuzi.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/6073063328.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/12096478589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=swords+and+sandals+2+full+version+apkPDF 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_off0000ae92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE92 10932 bytes
SHA-256: 2ba5c38273726bdc4cff4834dbccfd12c663b27e528919682eb9b42c444cd905
font_01_sfnt_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 15088 bytes
SHA-256: 7a54778179e8fb737a4d2944fadf726e1d96a648193283fa1587391e469ebb30