Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f829346c2d98e6…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 18:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 91b74d219783da182ebede4d3b00dd67 SHA-1: ee8ac6b7e1f5d65279d4721a99076827eeaf4e37 SHA-256: 23f829346c2d98e6339373079581a1625e36e57dafed055a1f19ed67225eeb75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm or redirection scheme. The primary purpose appears to be directing users to potentially malicious external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=car+io+games+online PDF link annotation
    • http://sbnjl.com/userfiles/files/97616589099.pdfIn PDF document text
    • https://viettrungson.com/media/Files/verosibatajogovur.pdfIn PDF document text
    • http://xycrusher.com/d/files/pakamulubiwa.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/9906428341.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/nuxisidesakivadopowe.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/35725261900.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/2648739588.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/solujezuwonivukadafuweli.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/85618154543.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/xarejetejefu.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/88647347248.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/nofabizonogaxowabikine.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/35942503271.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/roxizezemubudune.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/xakulirafalenovalulu.pdfIn PDF document text
    • http://haki.vn/uploads/files/46029806346.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161433347d2d42---39886931458.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/36464338485.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/ragafasula.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/xawezidovuxa.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16314871941979496444.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/sirivorukidanokeritep.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/82097166744.pdfIn PDF document text
    • https://ismart99.net/upload/files/bezutazojuwowum.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/18511249631.pdfIn PDF document text
    • 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_off0000bdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD4 10384 bytes
SHA-256: 88db6f229a13722068e71ae26101cceadf679c4baa4d0f8abe0fd9683aed3cd1
font_01_sfnt_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 16120 bytes
SHA-256: 60f533382f26a31e839736f7179b1a5fb8b056cb41ec2962eacafcab725aa505
font_02_sfnt_off0000fe8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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