Malicious PDF — malware analysis report

Static analysis result for SHA-256 89caee72e82d5611…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 21:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f36df855f475a135a5b08a3184c4bf04 SHA-1: 40389c1088274fa2fac9cfd6c20c16681019bebb SHA-256: 89caee72e82d5611bec3baae52289dff450f92506382d26cc54638126fdff6f5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are linked to disposable hosting and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware or visiting phishing sites. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=assassin+download+apk PDF link annotation
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/20709027817.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c10a67035b---4138138516.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/xibovirej.pdfIn PDF document text
    • http://allasclub.com/campannas/file/58218222344.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/85799145690.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/89412777815.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/42536489923.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/28666863199.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/xegetu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f735973a82---9597238096.pdfIn PDF document text
    • http://skia22.ru/pic/file/domonoxovezimedizaja.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/37049258698.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/25175305239.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/59492455240.pdfIn PDF document text
    • http://e-menu.hu/editor_up/xuposob.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/dewubobuwulutudetigevij.pdfIn PDF document text
    • https://themalc.org/files/file/80822144661.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/38600203083.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/60800624650.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zokadavipigemazog.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/sarazeribafenujegej.pdfIn PDF document text
    • http://makaroma.fr/upload/file/ponux.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109091024102512.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_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 17452 bytes
SHA-256: c4322046d65a59bb3dcd0513120868edce0afc617a54cbd9ddd34af4b36f8294
font_01_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 10212 bytes
SHA-256: 2e2a51f98c048886ef13cdf036b5e705f3feb22a8a530c106357ec7ea4d996b8
font_02_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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