Malicious PDF — malware analysis report

Static analysis result for SHA-256 8323807599b3e186…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 06:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 35680a3ddcd076941f6cde1762e088c6 SHA-1: d4461e697434c5efdf0f07af88ad808a9e6e92be SHA-256: 8323807599b3e186b07c5d81f7e73376af81ca8f1fb7c3987a28995e96120c1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to distinct domains, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://orchid-daikanyama.com/userfiles/file/winan.pdf In PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/niguniv.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/gapoloronazaf.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/sivoruwinolutakalivixufen.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/tozif.pdfIn PDF document text
    • http://anninh247.info/upload/files/wipovurarakagojel.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/70810040957.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/sadoruwutisizekalexale.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021921349312355.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/miduxu.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/63265877086.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/zoxipigexudaxar.pdfIn PDF document text
    • https://rinducm1.com/contents/files/47904640896.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/50639153118.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/04/210500177.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/92945309005.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/numuxuzarutogu.pdfIn PDF document text
    • http://ore-processing.ru/d/files/79288745257.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/zazupolizag.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/16328581353.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/12481485068.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161400f4e8f151---89794645377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+first+avenger+full+movie+freePDF 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_off0000b38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38D 15064 bytes
SHA-256: e02ca4960950c1eb892b5090fc43af2f583f7b3aed8471fbd530f516fcc89cc6
font_01_sfnt_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 10792 bytes
SHA-256: 17bd2293d56cf845ffb276fa39d4124911cc658e535e6111ab50857f8c9e7eff
font_02_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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