Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3437a775c3f9624…

MALICIOUS

PDF

82.8 KB Created: 2021-09-09 08:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29d4146d292e549d954c7990c498412a SHA-1: e5c8f84e9a589eb0035c0be4aa09e515be2108b4 SHA-256: d3437a775c3f962427f1b194c3e023acfa7d10cf9850808c25c4172abe8e24a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=sony+six+live+streaming+free+watch+online PDF link annotation
    • http://infinity8talents.com/userfiles/file/mavavep.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/79957828747.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/lulonevalokozifesiv.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/votige.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/gekexosuzipaje.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/wepebeleturoxuzobuwitoxe.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/lezisawuzo.pdfIn PDF document text
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/26365586024.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/br6dtr13m4it7ttutui9egipb2/2025642127.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/16488416966.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/81892641349.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210905133318.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/25921681501.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/89903281697.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/lazejimerodojenevo.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/58192688596.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/33412079271.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/kobigofuliwogogotebeti.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/78778977982.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/41704461817.pdfIn PDF document text
    • https://cian.hr/userfiles/file/87795104072.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/19352790333.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/29121619580.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/psvhvn0jvbacqgd6oto0s4smbr/13099628710.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/xemofabarawipowijakapavi.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1622737011613060cd4cf07.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/78044051816.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_off0000dbb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB5 11224 bytes
SHA-256: f2876b60a1cf701a3e041a396981f268037e04af0b56b6f08de58264fbd20191
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 18072 bytes
SHA-256: 3947032d4c8e58e1a50be04a501149d99f186c5af8fd78935ed2d7de3cafb071
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1