Malicious PDF — malware analysis report

Static analysis result for SHA-256 19eac21f7911fac9…

MALICIOUS

PDF

90.6 KB Created: 2021-09-17 16:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a719743764085f4215637b72d35c8a4e SHA-1: 1b511882e97f4d4d4cb1c0f8d0953ad7e77f746c SHA-256: 19eac21f7911fac989af20e74f116ce9f998fbb9c6b4be6d2ecab05edc35138d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by directing users to potentially harmful content. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://dentish.ru/ckfinder/userfiles/files/72345006053.pdf In PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/zebonepepevasopazuziguma.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/tekefusidawawovodavoxafid.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/ruvekalanamakepu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/954174815.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/valopepexifunefanukuka.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/51681350219.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/7907270178.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/kegusanerogatomefunuleme.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210909231815.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/mokulem.pdfIn PDF document text
    • http://17njl.com/userfiles/files/bexezofugikurewexagurusi.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a7e6b70c23a3ee48579640de3bb4ab21/50354605959.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/11564719339.pdfIn PDF document text
    • http://edeins.com/userfiles/file/3108075950.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/gililupodofinav.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/38093122019.pdfIn PDF document text
    • https://ratosatu.com/contents/files/25830235388.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/96238585258.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/lawagurobefobikidajugaz.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/89907941171.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/100686184613716b589d97.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/sumogalatejineni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chhota+bheem+the+hero+mod+apk+android+1PDF 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_off0000f7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB8 10756 bytes
SHA-256: 36c3be13354ab0eb5be18c47f69f597758d3944648bd598bca8a11576c97622d
font_02_sfnt_off00012814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12814 19740 bytes
SHA-256: 77f49f41a9f394b99c06598474071101a6318dd76914c0f63a5764cff8d2a8c9

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