Malicious PDF — malware analysis report

Static analysis result for SHA-256 007b9fec5543c11b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 14:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 56b47f698b53710d9cfcfb431128adb1 SHA-1: 2e137fdf35cd656991430edd73a05f935e70b1db SHA-256: 007b9fec5543c11b2bd02b4040b3576adfaa448bd878559248a14c8e477e9b82
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attack pattern involving directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://videlec.be/ressource/file/70638988516.pdf In PDF document text
    • https://buonoantonio.it/userfiles/file/bukotofotowol.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/46151462154.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/61065331185.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/detomopuditavuwiweguk.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/1000075988.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e19c921d---fojigizilokive.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/tipijuboma.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/25722417042.pdfIn PDF document text
    • http://www.mab-solutions.fr/upload/file/51381616453.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/76674167614.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/dabikutogamor.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/41452648943.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/77710079095.pdfIn PDF document text
    • http://thegioioto.store/upload/files/84402103264.pdfIn PDF document text
    • https://citytrafik.nu/images/file/74949138802.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/fekurumakirosa.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/6125112338.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/nilonudemoguvam.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/27788093415.pdfIn PDF document text
    • https://trainova.com/userfiles/file/gusoruzumibareg.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/35994642644.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/moferofoxutudubam.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/kiwatutazasat.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/11885338163.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/jimirusapuzosuwopexexot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sweet+potato+farming+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_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 17096 bytes
SHA-256: 1ba5f720c2009488ac7fc1d7aa774083ba76bd9e1c2fbc8f5fe23f9565d42a2e
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 10788 bytes
SHA-256: f9ddd8ae693dcb341580c92351b630f531193a5c6571db2566fb70f874a6c371
font_02_sfnt_off000129df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1