Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f643fb8811de4ef…

MALICIOUS

PDF

85.6 KB Created: 2021-09-10 13:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2610146589b70e83d82429b46bdba29e SHA-1: 11e055c1051fc22f038e74492d9a4dc9b8352e14 SHA-256: 2f643fb8811de4ef15d3ef2e074b258c764d1baff68d3ccb39317ac8057543ed
146 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URIs pointing to disposable hosting, and one URI directly to an IP address. The PDF's structure and embedded links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://swapnauraan.com/ckfinder/userfiles/files/27606708067.pdf In PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/neleg.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/54405623851.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/85049023700.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/9639799114.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/17912917057.pdfIn PDF document text
    • http://lscapital.it/images/file/gubiledepek.pdfIn PDF document text
    • http://njchemland.com/upload/files/tuvejovazokamumopem.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/33783287068.pdfIn PDF document text
    • https://keongracun.org/contents/files/fewagijuwenukaranigupax.pdfIn PDF document text
    • http://erpos.sk/data/files/84610657344.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/fuwodurozetu.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/36572929145.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/zojuxisa.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/mebiri.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/48910125117.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/kidetaxesoluzax.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bo8lcpgf39csaqj0furm8773ri/52472956969.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/87875990231.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/gegox.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/58578520268.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/69989102896.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0fb924463---sevarajanarivexepo.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=perfect+world+mobile+english+version+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC509 16348 bytes
SHA-256: eaecd8d8fd522c10bb6c38e7bcc7847058292b0b1d3079742b93441128788822
font_01_sfnt_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 24044 bytes
SHA-256: 2e80ad3460c3888f1e5e8b9f39a7e8e5cd3c80cff7a5a40d48d7ff213352ebec
font_02_sfnt_off00011597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 11452 bytes
SHA-256: f1e459529c052d2b59329b6f03a48149ba0e3f546901de602f470f66817b1c42
font_03_sfnt_off0001301a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1301A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1