Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3f6db3d83c1e04…

MALICIOUS

PDF

67.4 KB Created: 2021-09-10 18:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3efeb8ca3de90622cee78a4d992208ca SHA-1: ad783c470e0f01a52d6621c47b81a22ae220dffe SHA-256: cd3f6db3d83c1e04203424d12de457a729cd5907a71e330b018d8b8517604e26
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as an image-only lure, typical of phishing campaigns, with a high ML classifier score and ClamAV detection. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further indicating a non-legitimate purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://shiokuda1.com/contents/files/8202915664.pdf In PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/xufevitupaluwexibig.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/82490024189.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/2043832243.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/ruvitalimazukew.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/93312296435.pdfIn PDF document text
    • https://baongochoa.com/upload/file/30568259593.pdfIn PDF document text
    • https://greenways.at/userfiles/file/69552338458.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/66890599051.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/52b78cd7a382d30e3765feb5c0d363cb/dokupu.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210906175417.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/ratagofodaz.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/lijobilisibasulegig.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/pafukulasux.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/79382461254.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/83823002966.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/62456966743.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7cddedd87---90770006922.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/31965130782.pdfIn PDF document text
    • http://sakem.org/userfiles/files/65495954053.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/11570976263.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/nawofolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=stalking+ig+privatePDF 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_off0000ae22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE22 14032 bytes
SHA-256: ed524ab46fc35bad9232ab11f8b28fbdf59e9d6f586080a5f5f7802bdbb3f382
font_01_sfnt_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 10372 bytes
SHA-256: 4657fcc077ba8b8c5d667c451e1157bac27ab8ef9e675c306e093c1eb1c883ba

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