Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b1b70cbb66bf146…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 15:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 802f81548de56c232876c19f1ece979b SHA-1: 946cbe4314ef286626a464ad3356d480ebeaef8b SHA-256: 5b1b70cbb66bf14613c81fdd24b4fd8371e410d0fb3e900b36d370c2d6ee7fa3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains a large number of embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=block+number+on+samsung+galaxy+s3 PDF link annotation
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/nomuwajixiginun.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///remomovugawekanerepapofeg.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/61328461695.pdfIn PDF document text
    • http://gibisch.com/files/files/87729728645.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/jibisiluvesixiboxesaravaf.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/63512377386.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/87944072012.pdfIn PDF document text
    • http://balalajka.nu/media/vodunowa.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/wudotusinesafemubu.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/17047215988.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/xiposexiniwazobokutib.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/8f7b86bfe23a1c6a100f82cdf209be66/46669062287.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/tataziwutopapur.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/gagiwamamiruzosukodo.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/zapuvujixew.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13773326810.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/kidipupoxekuso.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/45412523520.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3de7cac7---dewut.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/xatomuxuxew.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/32128544036.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/55730103765.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_off0000b5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEE 11156 bytes
SHA-256: 09c9465c49930286e55787b2c9f9b36a11b9881116b06f83eed25991c511ea15
font_02_sfnt_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 15716 bytes
SHA-256: e2424f1d65f1decf2684699fd43ea545a78db893b4430f5b9c8e75c71579953a

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