Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40043e41c753144…

MALICIOUS

PDF

70.8 KB Created: 2021-09-20 13:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e30a5024f38864b5564a2013eaff1ef3 SHA-1: 87d41d49761302297010fab58dbecb5959b6f4e2 SHA-256: e40043e41c753144d2dd33e02f4696c50751e5f400e00b54f71d30a2c97237d3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The presence of a 'utm_term_redirector' heuristic further supports the idea that these links are intended to redirect users to malicious or unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smartpaintingplus.com/userfiles/files/57368034954.pdf
    • http://fmmvn.net/userfiles/files/tejorukema.pdf
    • http://hanabi-la.com/uploads/files/pexosuvakasude.pdf
    • https://liepasmuiza.lv/userfiles/library/75429422328.pdf
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/matusag.pdf
    • http://hadt.vn/upload/files/28889005585.pdf
    • http://nextlab-semi.com/files/fckeditor/file/6322381955.pdf
    • http://antonellascarpittadesigner.it/userfiles/files/22420427213.pdf
    • http://www.tahi.hu/ckfinder/userfiles/files/25944664419.pdf
    • http://thanhcongtechtra.com/upload/files/zirilijinamodosavusozisak.pdf
    • http://wx-test.com/upload/ckimg/files/202109050218112031.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/0lvvuv38ofu015h8paqbciiapi/tomesukeranoxirekoxan.pdf
    • https://www.edm-medical.net/ckfinder/userfiles/files/tujiguxozadozineforoforez.pdf
    • http://bulk-supplies.com/userfiles/files/39664364411.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/tujavix.pdf
    • http://pytextiles.com/userfiles/file/dokanumiku.pdf
    • http://yepuco.com/uploads/files/zoxefozunitipidatilo.pdf
    • http://ukrfirework.com/images/file/naxebinenivizixoz.pdf
    • https://thefertilizergranulator.com/d/files/vozakexi.pdf
    • https://szpital-sulecin.pl/images/fckfiles/file/fatijop.pdf
    • https://marosme.ro/hirek/file/javukuk.pdf
    • https://luminex.pl/upload/file/zodekutimir.pdf
    • http://mudrberanova.cz/userfiles/file/15787289188.pdf
    • http://askort.pl/Upload/file/gikelezozirolitadoke.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+ben+10+xenodrome+plus+mod+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b381.bin
558d7729ae345669d579789109d282b2838b62e215f680d742ab5b805dab291b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB381 11060 bytes
font_01_sfnt_off0000cd1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1A 16792 bytes
font_02_sfnt_off0000e52c.bin
b4a4683f78810e4a7e1667e129f01879f7de1512cc2ad7d3aa67626476b41104		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 15800 bytes

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