Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0b307bdcda492a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 21:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ec85900cd8678f47d0e73413fe835e36 SHA-1: 785c4c4bb1e0da67cfa556bd97b4b4115ec69696 SHA-256: ff0b307bdcda492a3f37926a4421f87607f40f348cbeae313ccb97ec676fa662
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also functions as a link farm, directing users to multiple external URLs, some of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish for information or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://originalavto.ru/userfiles/file/pudatorupevifaduw.pdf In PDF document text
    • https://baglab.pl/galeria/file/mifunalajituse.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/78381502380.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dawewarulozulorusuzub.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/xebukufutajulevufosaf.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/tusadozerowuzez.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/84586140679.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/torugakiwuv.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/14125362465.pdfIn PDF document text
    • http://valeneighbors.com/userimages/mabigiwozumotobowerod.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1372133498612f4dfec9269.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/vitawuxexem.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/rasatexutadal.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7cb424d3c050bd3519cc536264601707/29952648560.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-11/20210911185522704353.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/viregadotonewefadimelo.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/36584126845.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/65686829016.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/jotepab.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/beviminofobivonewid.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/55899371415.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/zegilap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=tu+dien+viet+anh+oxfordPDF 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_off0000c36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36C 20016 bytes
SHA-256: 46c60fec0dd58c19c1f8edb2ffbc236d3e3ee0d35a341a3bd5849f97bad18a4e
font_01_sfnt_off0000f754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF754 10468 bytes
SHA-256: 62d79ba8a8790363065d8daec309a83f13958edcc7590c5c91d10d3e8cd8fa03
font_02_sfnt_off00010f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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