Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb1ba60e0600d98…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 19:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e9a32c1b3fc389b5cbd36ca1469dd9d SHA-1: dfa34562df2972ecc19e1504fcace99cf580d82c SHA-256: fdb1ba60e0600d9866c1fce48fbd4208dae7cee11d918cec83ccc4b53e8f8938
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to suspicious domains, and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the PDF is part of a link farm on disposable hosting, suggesting a spam or phishing campaign. No scripts were extracted, but the presence of many external links points to a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://domadoma.cz/userfiles/file/lorajuwezajorug.pdf In PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/rozijodexunafovogodabe.pdfIn PDF document text
    • https://jagominum.com/contents/files/wugizuronajoden.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/81250673304.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/kotatoxot.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd3270c99---46199254687.pdfIn PDF document text
    • http://dhf-china.com/d/files/24377151143.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/31935126525.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/kotubatef.pdfIn PDF document text
    • http://c-amc.com/upload/files/vuvoboto.pdfIn PDF document text
    • http://etkenkalip.com/files/seduxidixefonivoxewukilus.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/60794609807.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/70621526931.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3bfd8bfba5ab43e6849635ff4b776f7e/2038569916.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/80127092104.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/wonexu.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210902_055242.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/50177305233.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/9992307723.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/rufefe.pdfIn PDF document text
    • http://hbaoge.com/upload/files/35231203176.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/wifemixibutelofewilixefem.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/4042980229.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/24346553293.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/megexikaxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+screen+record+on+android+with+soundPDF 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_off0000d734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD734 17520 bytes
SHA-256: d567ea1e8072fa8f4a5c814faadd24b9f714c39b245688bc87f81f68ec10dd38
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 10600 bytes
SHA-256: c1a21100f00f2c9ea42bca019df07bc727c6af824f7592d13083c35bdfb6ef00
font_02_sfnt_off00011c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1