Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76aebb996322813…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 11:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 650deb5a624bbe993dfdfea08831f0da SHA-1: ff27c64e7676bb7580b4e176df952247917ab384 SHA-256: c76aebb9963228133aa8c9ad40d3c452ec1273c1be142cfd2d292aa169795015
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous embedded URLs pointing to other PDF files. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

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://seoulmenu.com/uploads/files/82113023869.pdf In PDF document text
    • https://firsatpin.com/calisma2/files/uploads/zifinapanojopepova.pdfIn PDF document text
    • http://espokebar.com/uploads/files/57596276610.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/64600189086.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///nuvinojijexakofenuded.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/xetepodefad.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/63092526364.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/4404767614.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/nijoruwopuwo.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/laxuvafalofetek.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/53980034191.pdfIn PDF document text
    • https://polaria.cz/images/file/wawisibado.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/18560538525.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/45055143042.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/72831009280.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/ragovobulufo.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/31193737871.pdfIn PDF document text
    • https://questyme.com/userfiles/file/11070102484.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/nozilitesafipefomukabo.pdfIn PDF document text
    • https://nycsmindia.org/ckfinder/userfiles/files/puruzarepuzunobiferixa.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/1446540245.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/nebosetegofitipepugolegu.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109141822499480.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/zufekadonipam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=new+battleground+game+2021PDF 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_off0000c378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC378 16912 bytes
SHA-256: c27eb34f776415039f682173d442f6b8cf07a4983f3aa4803d4de38c019cdfbd
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10928 bytes
SHA-256: 05e936c1e6d9ccec8382e5d207f3adde304c02846c8279d0b6dab8d43f2c61dc