Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f44943fecd7489b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 02:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3f178abc9e3824fa3b5554dacc5f2189 SHA-1: 6466df6954279ca8b553f6509aed988fd8983d4d SHA-256: 6f44943fecd7489b86aada277c04e9eb1886568688acfed669585637d0770ce0
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://chokysitohang.com/Uploads/userfiles/files/67789186648.pdf In PDF document text
    • http://ipllaser.in/uploads/16882753981.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/29776267314.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/xijiwanumizojutasejidu.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210903234953.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/zidolumitukavo.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/71594911540.pdfIn PDF document text
    • http://greenld.com/userfiles/38946840987.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/lusexedurawawozebenidu.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/40069935306.pdfIn PDF document text
    • http://findusafranchise.com/files/files/80771022717.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/gititotasibakotuje.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/dipuganuvozominofoxo.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/buzodozijag.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/poromog.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/32626869421.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/52435707798.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/79731233025.pdfIn PDF document text
    • http://bndweb.nl/upload/files/10799769361.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/fovetalokenatugabegax.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/teredagetuzoz.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/90977009457.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/1246351109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=sat+guide+book+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 10660 bytes
SHA-256: 9aec6a245b4d01bf8544f219519243ea77fe8974862326c5c95fd9d0a893e600
font_02_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 16992 bytes
SHA-256: e6401ef333247973ea2beb2a6bfd23b1fc1cf1de0dcb101d07363f7a5390b2b7

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