Malicious PDF — malware analysis report

Static analysis result for SHA-256 10443b1744cf4e52…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 06:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dc4ea3693c572786a384033da09a7357 SHA-1: 8f3f710cbe17e7068cffd15ea459d4afdcd5c82c SHA-256: 10443b1744cf4e5217b02ec04a5036235253e0047551153d969a995cb4515038
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting it's designed to redirect users to harmful content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://lyonsinn.com/nbloom/fckuploads/file/radofojosulubot.pdf In PDF document text
    • https://pacantioquia.org/aym_image/files/wawakuwu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fca27a169---76986196742.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/63382854833.pdfIn PDF document text
    • https://keongracun.org/contents/files/94449950430.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161327c6fa36c8---vezowurorunokubanuzusarul.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/warekakedamuxenaj.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/90226768787.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/58368183678.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/49813938434.pdfIn PDF document text
    • http://mrybalko.ru/files/giboxowi.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/46102134263.pdfIn PDF document text
    • http://esistore.de/userfiles/file/nozef.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/vurimujizukolut.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/zezunatidupi.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/bivopisirozosazejiwomorud.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/70987952137.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/joxepusejomabevonakuf.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/40753794316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=compression+set+of+rubberPDF 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_off0000d922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD922 18196 bytes
SHA-256: 3410e994ef01807486ba8920ad9ee5ab5e5ca3ba66005a6f94b5f18007e04940
font_01_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 10580 bytes
SHA-256: fca577c8d226cb0b67020c973c7e6ba5cbd3a3005d0edefd1256ac2dc665ef34
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.