Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8c7e2825b6f0c2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 10:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b02415779161cea8b3cfeb062e53a11c SHA-1: c9924e56d90a7e328816dd3100279f1ffa7b1be3 SHA-256: 5d8c7e2825b6f0c2208b7d04ee3da78a57baf8100749b63fcbcb8b604ea085f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting and utilize UTM parameters, indicating a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://laborke.ru/uplcv?utm_term=8+ball+rewards+apk PDF link annotation
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f7dd399e---topovalapofisop.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/20020175929.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/sudev.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/lalajojagupigimiri.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/tufuvalelipitejatuto.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/50798078291.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/51935777856.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb84f1abac---dutufug.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/50948233936.pdfIn PDF document text
    • https://mkontroll.hu/File/84516726471.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/24581799254.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/sigof.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/10767471812.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/43688907279.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/zimosawifolijenuzori.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/55093263033.pdfIn PDF document text
    • https://trystsalonri.com/images/file/xugap.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/99361601999.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/59868560960.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/saronagipufudirale.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/80699277148.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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 17040 bytes
SHA-256: 374a329a69d62dce929329de0a2ea78e43b6e13df7dd3762cca8d16aa939011a
font_01_sfnt_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 10400 bytes
SHA-256: 5b58e3e654335385c622a4cf7bb740bd020bb9de7279ed19065ead6d208124df
font_02_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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