Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5bca27ab6587034…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 06:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc8348f63255db61d5fff84e1c6a3cbf SHA-1: 54fc89dc2fa770a9c088b96c092838c1c0880c7f SHA-256: d5bca27ab6587034f5190f25c4485344db35fc29dcfb3c8ed24f3f4f5569d86e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggests this is a link farm designed for phishing or malware distribution. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=ipsec+remote+connection+android
    • http://envisystem.com/upload/userfile/files/zuvorakigutujukikinul.pdf
    • http://medigroupvn.com/upload/files/paropobawimolodu.pdf
    • http://m-s-g.ru/userfiles/files/wivugezebedazudolimug.pdf
    • http://csc025.com/userfiles/file/20210906225533_3gizbv.pdf
    • http://vagtteam.com/userfiles/Files/vosefawaxalamiwisekof.pdf
    • http://singer-island-condos.com/userfiles/files/25284835756.pdf
    • http://adacu.org/userfiles/file/20210922151319.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/63666003467.pdf
    • https://biorenta.lt/ckfinder/userfiles/files/litez.pdf
    • https://juraganmonyet.com/contents/files/tilad.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2plv2neqam7gd6rb6eja6dtjti/vudogovikokubokegowa.pdf
    • https://baongochoa.com/upload/file/newupis.pdf
    • https://easy2ticket.com/upload/files/27889093563.pdf
    • http://www.donboscovizag.org/images/files/82941207850.pdf
    • http://stmrcstvm.com/userfiles/file/buwoxofosixapiza.pdf
    • http://peknanevesta.sk/media/file/roxetizilifiluk.pdf
    • http://gaishachuukobuhin.com/js/upload/files/69368660099.pdf
    • http://montoaneli.com/ckfinder/files/85231885563.pdf
    • http://loadcell.vn/Images_upload/files/11147438055.pdf
    • https://fajanav.com/aym_image/files/lonujefesupasuretusu.pdf
    • https://plewmal-d.com/Uploads/files/wagixaropujep.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/puvuloteveterugidevis.pdf
    • https://cingenito.ca/upload/editor/file/13324677368.pdf
    • https://ljlconst.com/admin/images/file/sexilakimikudofaxuj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3BD 16792 bytes
font_01_sfnt_off0000cbcf.bin
aade95814930134f27e015550055de9849476a37e3dcec967d1a9c2830d15caa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCF 18768 bytes
font_02_sfnt_off0000fb8f.bin
5c841a3aa8428ba65fe2b8e38045d099879094a43271bb5f67cfd05c8eac11b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 10580 bytes

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