Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea7eea4ab5b75e1…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 04:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5cfbbcaf47ee1a9d7a382a5d2714a76b SHA-1: 4a1ccb5ddce504865bbfd5f4903381897bb49883 SHA-256: 4ea7eea4ab5b75e106f78fa0498384effd43a90bf87a3c2a6f43055f423c260b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload from one of the numerous external URLs found in the document, which are characteristic of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://youxsoft.com/uploads/files/bifokuvasezerejuwobe.pdf In PDF document text
    • http://sjhtractor.com/d/files/92520899078.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/xonibojivawufo.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/jinimixozukubebog.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/56248508174.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/gowunefuwa.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7805874048f3958a3c97b87be513a33b/vitotuf.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/zisolelejeri.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466ed38e20f---sivutaxavojekifalafodoruf.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/82786313670.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/12122233012.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/57017753656.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/mitimoratufefizojanuv.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/38616325724.pdfIn PDF document text
    • https://heyratacademy.ir/file/metipitafelepazew.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/59280436687.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-10/images/files/medeza.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/buxadizogigegimufuxexowaw.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/jorozexeribivolez.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/xuwejarewasodeganozule.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/rasoxukumevadivut.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/44665592033.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/mazotapofo.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/sotifozutiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+definition+of+contrast+in+artPDF 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_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 18192 bytes
SHA-256: 69a612eb1816e2570a48bdab3302acbf25c2555e1bcf9d1e5936b6bb37a56d31
font_02_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 10488 bytes
SHA-256: 8794f21312969c03f89e2d46f455ae980dc3d9fe26a777bb8e773437097f5c1a

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