Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abb0857590f1161…

MALICIOUS

PDF

69.7 KB Created: 2021-09-28 08:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9501e1ff94c5b9e7e1e5777ff6be789c SHA-1: 839135784f6c81439e4a7d9ce36b65dc2c9144a9 SHA-256: 0abb0857590f11611299c8decb30da1092819a2d764e1821453733a7fbe15410
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The embedded URLs and the heuristic indicating a link farm on disposable hosting strongly suggest a phishing or redirection scheme. The file's purpose appears to be directing users to malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=star+wars+and+history+pdf
    • http://starcity-vinhomes.vn/app/webroot/img/files/13977217067.pdf
    • http://foto-klub.dk/userfiles/file/pojazofobazogarurapebir.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/81144969919.pdf
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/9883043532.pdf
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/81437352191.pdf
    • https://agriplan-rs.com/dados/ckfinder/files/988404506.pdf
    • http://akiisushi.com/uploads/files/fekakewigakel.pdf
    • http://caythuocnam.org/images/files/ganexalamizumafozoruru.pdf
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/43811803999.pdf
    • http://ydchem.cn/filespath/files/20210920075115.pdf
    • http://machinesupplier.cn/data/product/file/202197_4392_428.pdf
    • https://mackbeks.com/files/file/gegidanidogijexukubomafu.pdf
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/8839475331.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/40a4a84522da877709b5333e40b87f73/sokuvarilivonegi.pdf
    • http://eia-edu.com/userfiles/file/diwijurogafuxop.pdf
    • http://kbcsisa.com/upload/fckeditor/file/vamofitepote.pdf
    • https://beldaoyun.com/calisma2/files/uploads/23597720460.pdf
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/63763484213.pdf
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/zuwelirovo.pdf
    • https://hkparkkonutlari.com/image/files/xosudoboxepozasewukixise.pdf
    • https://yenhuy.vn/upload/files/10771845175.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/digaxerajerodopadapal.pdf
    • https://cowichanmusicfestival.com/userfiles/file/20669467103.pdf
    • https://zlato-eu.cz/upload/files/niwole.pdf
    • 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_off0000b017.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB017 16792 bytes
font_01_sfnt_off0000c82e.bin
1c0990b6a18c486e378a6c7ec3754728b1e8e756d6d8e5a483fe7ed4fce4885b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 10692 bytes
font_02_sfnt_off0000e0a5.bin
2d833fb6dab8e87236e2776855e819087a3ceeb8014a1ab18bb8780325a33795		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 16096 bytes

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