Malicious PDF — malware analysis report

Static analysis result for SHA-256 563ae593f4192773…

MALICIOUS

PDF

75.7 KB Created: 2021-09-21 16:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af120146261fa44155637df2bdb512d8 SHA-1: 40213b2412c3124a31e0cba9c115480b055a0222 SHA-256: 563ae593f4192773b6c014235bb83dbaa1251e847e8bfddf03a0216b5bf7b1e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially malicious files on disposable hosting, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to trick users into downloading further malware, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://physio-praxismitte.de/userfiles/razide.pdf In PDF document text
    • https://riwg.in/userfiles/file/88644900226.pdfIn PDF document text
    • http://jawarakreasi.com/file/gamuvekisedepava.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/fajamurizagekexenexexi.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/66690622691.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/12198493775.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a696f2eabe---lirumu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16132362824da3---mavuroso.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/49663896395.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/garinatin.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/4957611362.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/kemeborutax.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/11097778489.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/nururosiponivijewegage.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/35256953868.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/64055622823.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/4710663595.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/jogaxenogemun.pdfIn PDF document text
    • http://ccshecea.org/upload/files/55527595767.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/9045587705.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/43978875790.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/19139567631.pdfIn PDF document text
    • https://anakmeong.com/contents/files/vuwitagorapoxurixuwumajat.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/turufelanufewenirozaw.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75288548177.pdfIn PDF document text
    • http://hmed.vn/upload/files/putoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=picsay+pro+old+version+apk+downloadPDF 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_off0000c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 16820 bytes
SHA-256: a9fbb822cad9ebc48c23b7bf71752950d262a76175875256a73cc664a48d3d6a
font_02_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 10768 bytes
SHA-256: 4c323367990d95d4753eaf84275bc82b205a98754152a57f789e138295e293ac