Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6bb39b117f11cc…

MALICIOUS

PDF

96.7 KB Created: 2021-09-18 01:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41bc74bf9bcc607a3c9dced2ce9496de SHA-1: 51357f0301066e9e8e27201c97f177c639aaba1c SHA-256: 5a6bb39b117f11ccb2a4b5a5d2c32ad2b73562ca43c3848fd7a77fc5905196c6
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 phishing or trojan threat. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs that likely lead to malicious content or further infection vectors. The presence of embedded URLs and the link farm nature strongly suggest an attempt to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414305d4762---pulerelisipe.pdf In PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/6374278897.pdfIn PDF document text
    • http://eva.am/files/10161e9bdb1d8f4d.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/siwukipiguk.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/58775599446.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/jukuxidiruxa.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/lirikegoxoruj.pdfIn PDF document text
    • http://showpelec.com/data/file/20210901_214356_941.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/95658802793.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/dc249d78d14ff60d53b460d2b88af489/40593267066.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96251590553.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///badurinufejuleriwetuzezif.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/mevinamiludefuwagojarugo.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/20217121055.pdfIn PDF document text
    • http://minipit.com/data/files/66190557676.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/55971635187.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/32062393146.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631570385belebuwizexigama.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/surupomebi.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/muwotepi.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/lakaravokowu.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/junor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=redmi+note+9+pro+5g+bdPDF 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_off00010eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB9 20872 bytes
SHA-256: 3eb5f1d645b5ee8faa5e39aa212b3c0b640c460d8b03e33d68389d151a0b26c1
font_01_sfnt_off000144af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC6 10848 bytes
SHA-256: 674f619a6550cbab8a3c71472bf098600754da43d286ae80073b99ace49f2683

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