Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0270838ab6c93bd…

MALICIOUS

PDF

69.8 KB Created: 2021-09-19 02:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66cfe54442a891d2cb743a480734592e SHA-1: 25d97a334ab52dc7b6cb6050038ddcb813e17bc1 SHA-256: e0270838ab6c93bd71d2e70a27e2772bde44b0c0a7a9a8bc2dc81bd3c118566c
66 Risk Score

Malware Insights

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

The PDF file contains a high number of embedded URLs, many of which point to disposable domains or are part of link farms. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to distribute further malicious content or lead users to phishing sites. No scripts were extracted, but the sheer volume of suspicious links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 4

  • 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://artechq8.com/beta/uploads/files/welum.pdf In PDF document text
    • http://datacomsystems.cz/userfiles/file/74062168231.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/22070963310.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/21217615006.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/fejojuxuxaxido.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/nowipod.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/domekipifawudufajatona.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613ce421b3676.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/lonetomobigijasusog.pdfIn PDF document text
    • http://badgerhillfarm.uk/28755271530.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/nulazidazefutowusix.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/86493275284.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/g3t4q1tiljut8v2a9h5ofjn0cf/76855093040.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/42865419720.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/durujom.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/4790011008.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210917_D1A6E849920CA0EB.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/wuvusej.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/jawobok.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/46493075403.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/tugugenem.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/61235182959.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-8/20210908032244324119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fall+guys+apk+download+on+androidPDF 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_off0000b227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 10704 bytes
SHA-256: ae9405460f89ef4d29197483d0d8dadb4a718103ce8629d7be7d21387a428a5c
font_02_sfnt_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 15572 bytes
SHA-256: 7a2b6fd592f94a2ee16ee8c066b6716158aba4f4234994af494166e576cedf5b

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