Malicious PDF — malware analysis report

Static analysis result for SHA-256 3231c15719b832ff…

MALICIOUS

PDF

102.2 KB Created: 2021-10-06 06:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 255950355c30fdbb02b7d8a478fc9eda SHA-1: 0c9a22e1a2243dc366a572b2cc15448487c1e128 SHA-256: 3231c15719b832ff1c2b9e645c7d6d130841653b1a1825b10f7bee4331f118bc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites, likely for phishing or malware distribution.

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 http://festacreativita.org/userfiles/file/kifinoteg.pdf In PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-19/20210919190408158197.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/joxofabem.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/63797154816.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/55786250435.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/47941437536.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/43676714333.pdfIn PDF document text
    • http://proxima-design.cz/files/file/namadosaropepes.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/feriworigesalutejetugaf.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210911224915.pdfIn PDF document text
    • http://napiarsaigh.com/images/kejuwizul.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/18c11e681aaf11bfbef286a4c86808ff/kumifavimopefuzadixemavur.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/juvewebomesitu.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/fixinuzelalisabep.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nebomufafewesobuludubi.pdfIn PDF document text
    • http://watch62.ru/files/files/vewukagar.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/zesamevebulawa.pdfIn PDF document text
    • http://paulabenveniste.com/UserFiles/file/29168909623.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/63701886808.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/gaderof.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/kakujatagorepifo.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/xefomufafel.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/42135957193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=synthesis+paper+outlinePDF 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_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 18512 bytes
SHA-256: 75f0a0ea307ec8142579f5fb6fb5c0bf5f5f1901a46cd9edb08f4cdc68f9f1cf
font_01_sfnt_off00015aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEE 10640 bytes
SHA-256: 1eadf9d724e347fb4e003fcf38d2dee912bdef550180deab571a97ea110e924b
font_02_sfnt_off0001733d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1733D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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