Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b753cfda481f7e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-18 12:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dcb1cb150c2ff1078eb8687ff276e159 SHA-1: 6475c46380d385309afe131fca36cddb6b1aaa3e SHA-256: 26b753cfda481f7ec301f67e87743f5d865dd9ec080fa133fe69f73dadce6824
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high number of distinct hosts and a link farm structure, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of external URIs and the link farm heuristic strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://spyboarcams.com/files/81705957771.pdf In PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/bapefumodofare.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/17105577474.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/41048927911.pdfIn PDF document text
    • http://ihdbd.org/upload/files/jupirid.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109050054075284.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/70943000469.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/gifipo.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090109594335.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jofexorup.pdfIn PDF document text
    • http://xn--2-7sbddqrtdw3be6jua.xn--p1ai/userfiles/file/3060636023.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/33637151497.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/51433060627.pdfIn PDF document text
    • http://onelove.cz/file/19689696542.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/filevujujizogupej.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/depoteziterovotafigupibuv.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/gaxabetinusiwowesufazogew.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/65438675972.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/najikekabajiraj.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/janubuxekomazudu.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138181a43b68---gubefilevu.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/demigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+sims+freeplay+latest+mod+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 16484 bytes
SHA-256: 2ab6337ee7e799182fe7c2279bcfcd6e416712ce8b59b29a3f91e7b21a050342
font_02_sfnt_off00010a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A58 10828 bytes
SHA-256: b612828899e17a6afaa5e6f040c1c80b14acefdadd21a90a91fed4c7d44b7ae2

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