Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de33da02b43b576…

MALICIOUS

PDF

80.2 KB Created: 2021-10-06 17:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39a794620254dd60fe914064c5ff7d0b SHA-1: d6b01e10e0c3328ce5295176eed863098a577de5 SHA-256: 3de33da02b43b576c3ca76425bdd5631b63bc79de647d90b9abb0160a86c9262
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/fenanejamajabuwunimigur.pdf In PDF document text
    • https://belitour.ir/basefile/belitourir/files/50097040476.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/60514639134.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/1676758757.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/79395767438.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/9b2b6894104b640cb97b608e4b364a72/82202989486.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/62781586421.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/ladulatetudonanamerukede.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/tetazadofa.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/345580aefa0c11650c15b0909eb1d216/pofivewujuse.pdfIn PDF document text
    • http://unite-chem.com/upload/files/dibepufoxelopewume.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/rodexugitawolikebej.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/nuvigotufixowu.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/58758271664.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/4298142212.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/66463587135.pdfIn PDF document text
    • http://gardatrans.com/content/Files/19191788487.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/jokanilotetezovi.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/85029543750.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/suzagifedopoberijoref.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/15454543786.pdfIn PDF document text
    • https://ssangyong.adasenotomotiv.com/userfiles/file/tizotunetugevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=computer+hardware+and+networking+questions+and+answersPDF 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_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 11248 bytes
SHA-256: 8b135d6b72d50792a359c4904d0058d1688156dccf5f6b3a8dab19a2c912d90e
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 17548 bytes
SHA-256: dbfc432f0840a67a01e5c0913ce8208d4b7dc1b69c8ab04ae2bc648d3294642f