Malicious PDF — malware analysis report

Static analysis result for SHA-256 887917272d4184d0…

MALICIOUS

PDF

75.6 KB Created: 2021-09-21 10:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c33118bdc8fda7a8ea9a668e876f9af SHA-1: 46980e92da5f4632d1c7b593f8e82ef5877183ad SHA-256: 887917272d4184d07e782991111b63e72462e5c816a40f8b908e593135245e82
126 Risk Score

Malware Insights

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

The sample was identified as malicious by a ML classifier and ClamAV, with high confidence. The PDF contains numerous links to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to create a link farm on potentially malicious or disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://baikalspring.ru/ckfinder/userfiles/files/66401481039.pdf In PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/41388076762.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/84115057322.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/tudifavatolegopepinemum.pdfIn PDF document text
    • http://espwireless.net/uploads/file/bamojabedapuratudexi.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/96460385571.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/mokunijedosaxazijorupoxuj.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16131a81f18208---kefijelofepuxaj.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/82314463975.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/wuzilidegosatapabexuxunu.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210920030106.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/dikabigedokixibozejikape.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/vebezotivox.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/85252507132.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/zefipozuji.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/62939022193.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/98704065718.pdfIn PDF document text
    • https://kovrdom.ru/sites/all/sites/default/files/file/ligubobevobivo.pdfIn PDF document text
    • https://ibextrail.com/editor-images/muxidaxorotetid.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347ea765c47---74510999867.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109151909535378.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/87068784252.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/nimorolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+file+managers+androidPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/falef.pdfIn PDF document text
    • 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_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 16680 bytes
SHA-256: a83905d3bf1cfa7517c023da42940bddc9dbc44253d8a5d3357febe09e3cb8e6
font_02_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 10752 bytes
SHA-256: 7ec46184d2decccb121a045f4f2299a991271b28a3fe4ae720bb33c987159f92