Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d07fe8e827cb8c6…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 08:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3d27e955846657b481ef0d56fade3da6 SHA-1: a6f73d2a2affcc3a678774b96a492b2370137fc2 SHA-256: 0d07fe8e827cb8c63333a246c1901fb7456fa80f72b276120e68b861a4185fa5
126 Risk Score

Malware Insights

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

The PDF sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the large number of extracted URLs suggest the document functions as a link farm, directing users to potentially malicious or phishing sites. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://dietgame.net/admin/fckeditor/data/file/20210916111219.pdf In PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/ruwituvutoxab.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/51473122728.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/10156293267.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/loturitu.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/31512202636.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/83463383792.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/82266617595.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/muwina.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/49105143734.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/47281385953.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366654e51ac---firidipaxuzeb.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d326816f7---85975286639.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/rajisavijamil.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/vejotifezidemopafufifaku.pdfIn PDF document text
    • http://dges.in/userfiles/file/datuzes.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/76863050002.pdfIn PDF document text
    • http://habibitours.com/ckfinder/userfiles/files/xamas.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/gonowibutoxomadit.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/77169452994.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/jajefopi.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/kabimutasikeginuzazowuwal.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/mulujofurubutefugazi.pdfIn PDF document text
    • http://klpa.net/userData/board/file/22858391380.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/2272817859.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/59189902438.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/ponokasetikigimonibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+studio+add+external+jarPDF 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_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 19252 bytes
SHA-256: be902881fe5eeb29df17548f49b66a38e9c4480ec71267fd12e3d0ef7b7b684a
font_01_sfnt_off0001176c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F83 10556 bytes
SHA-256: 0f20dc500c48e401b844cbbd0e014fbe0cd6bcc1363d0cdb675af91a3fdf01b2