Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d9b29adf1861e84…

MALICIOUS

PDF

81.0 KB Created: 2021-10-21 19:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff18cb8ba7baa644f0cff276179133b7 SHA-1: 61d6871bb086e1bb4aaa6ac8abeab39c6a7aa2c5 SHA-256: 0d9b29adf1861e84cb12fed5d65a29fd794d87ea839214c9b75d884ed6bf5b7a
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files. The primary purpose appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://splogservice.ru/content/file/sewonojixinutelixi.pdf In PDF document text
    • https://centrorevisionimonregalese.it/file/wevenabarenixa.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/19103025449.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/97547064283.pdfIn PDF document text
    • http://3sdent.com/upload/files/todatizewidixakegowuxe.pdfIn PDF document text
    • http://knipia.com/userfiles/file/3759840557.pdfIn PDF document text
    • http://insk.ru/img/userfiles/file/18578365179.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebfeebdee---54355688411.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/segebuzigipimeleka.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/sazopanalutaga.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/47306255610.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/jakagewalugexir.pdfIn PDF document text
    • https://valaszut.jobbadni.hu/userfiles/file/korodibewuditamisova.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/39110456137.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/17173318486.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/63183076891.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/wajesugemaxozukutunoxuri.pdfIn PDF document text
    • https://cityface.cz/res/file/fupetesinexunama.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/98680376955.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/8931972025.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/6cf3e15030c58c89be425aa464eb0eb7/40582504880.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/fosibuzatezaziv.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/53632312643.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/87961647166.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=genotype+is+to+phenotype+asPDF 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_off0000d6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CF 10356 bytes
SHA-256: 41d5f1167f8e95c9fad27c72bc1fab81ca2b7dc82c7792cce81225e46a304677
font_01_sfnt_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 18512 bytes
SHA-256: 8c80bb2033db9161d1282cd6048da15973516184a5cdcb464225b22f77bc1bc0
font_02_sfnt_off00011df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1