Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc45e1390102bdc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 04:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 10a268c0e6e9b6ba6b80e8261773630b SHA-1: b2ac10b4eb2705d0460327a41e86f4e69784bb6a SHA-256: acc45e1390102bdcfb9a8d4afa40a0a85dfc6e89bc881151a1ce2050d58812a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting an attempt to obscure the true destination or distribute malware through a network of compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://simonkuehner.de/gfx/userfiles/files/24115151673.pdf In PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/pamanizazisuza.pdfIn PDF document text
    • http://sciattella.net/images/file/93311463977.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/011811384225.pdfIn PDF document text
    • http://quetthe.com/upload/files/46285232792.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/nipikumuzuwi.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/bajebikozugideke.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/50931515830.pdfIn PDF document text
    • https://conrays.ru/f/data/91097562908.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210902085005.pdfIn PDF document text
    • https://value.ae/userfiles/file/limuvowaxisujorel.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/naxuwopivinowa.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/32711980408.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/kewovivebinojapotafel.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/44546991587.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///semuwaj.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/71570709167.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/jabewozigozogazeku.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/wapozitebumokodiwekelozif.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/papaf.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/vofizabinov.pdfIn PDF document text
    • https://emenu.hu/editor_up/10606353435.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/81328497269.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/94123141810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+living+bible+download+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_off0000d85a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85A 10664 bytes
SHA-256: 929dfd43dc38c3dc67c1cb2dd9a57586f5ec483e42e472cc94554a2a7f97c6a6
font_01_sfnt_off0000f047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 19044 bytes
SHA-256: 98f5ca81a25a575151eaa11000a7cd874f1f31e2418dfb5d6bae5ddab8750abc