Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee90f314aaf3217b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 16:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7f2655a0d22b859c30a0fe0207073a5 SHA-1: 863f94a58faa7221ea70811c82b19d034997e3ee SHA-256: ee90f314aaf3217bc282fa1f214e9b870602d50dd31c8e829071f2b8a41e6701
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and a heuristic identified it as a link farm. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://erimti.com/userfiles/file/9656391809.pdf In PDF document text
    • http://phongthuyphatloc.com/luutru/files/84007363388.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/zemalopogosa.pdfIn PDF document text
    • http://licausi.it/userfiles/files/vudolafonimofelani.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/zikivalanewigebutipalamu.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72619239039.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/88431676592.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/66131105878.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cp7kr2q6ffsca95oo4m4d8tqs8/7438467081.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/dinurezemepez.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/bofab.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/fofobugiwefekumuxuruvabak.pdfIn PDF document text
    • https://tierlistei.ch/downloads/95870219634.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/3888024013.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143c1563df6f---lasilawawar.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/ruxexidimixa.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/ditaraxajopapuxagalokozi.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/bojovekudigu.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/30725308587.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/mefijofa.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/91993944119.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/xanirigutelisafulipiwuraz.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/pilatiduxez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=content+marketing+proposal+pdfPDF 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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 10964 bytes
SHA-256: c6f6afab6bb3993b86858e0f3e6cc5a80247fc7e79eb3d64b6ef56e6dacf2503
font_01_sfnt_off0000fbed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBED 18552 bytes
SHA-256: 580836840ddd3c9d210bfc20b4bacca4c2b05208e5c64c943fa2d8bcc66328b2
font_02_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1