Malicious PDF — malware analysis report

Static analysis result for SHA-256 6804a7ef334bb26e…

MALICIOUS

PDF

70.4 KB Created: 2021-10-09 06:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ae480330050d083e77fada0fa7b3ea4 SHA-1: e8428979c5155147503c6a43f494ae0c83bb4477 SHA-256: 6804a7ef334bb26ee81deacbfd87233bad79cfa1a90c8e001e53ec9753b88333
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting a malicious intent to manipulate search results or distribute further malicious content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://kirakuramenandsushi.com/uploads/files/61609696836.pdf In PDF document text
    • http://vipnjl.com/userfiles/files/29763067415.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///55702005848.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/kibelemufoziwake.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/77930506306.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/13321368992.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/xuzegases.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/65440234370.pdfIn PDF document text
    • https://partetesal.ir/data/file/xetezivifelimuvetiku.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/gujixenimutup.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/72542727725.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/68207118625.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/65096848010.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/65798943919.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/vemilokebuviso.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/buvivir.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/zokaxavafakebob.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a190a7ac89---migib.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/hbfarsbeto5imjcn8nceepb4bl/26287744507.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/zonejuxunobodej.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/68458072593.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/bijasefes.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/69008370109.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=can+html+file+be+converted+to+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB425 10952 bytes
SHA-256: 02a27b1c2e510ae69f788d7bce90f84afec8cb0aad37b42ae4258308d47e76ad
font_01_sfnt_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 15188 bytes
SHA-256: 5bfa4fe530a74862cfadfe9f1fe56430894619d0fa977aa76316ca1f7aa274ac
font_02_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1