Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bdd491938d64e0…

MALICIOUS

PDF

71.8 KB Created: 2021-09-21 00:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c87df7445d00b5fec8b5a4a09f8bcd0b SHA-1: ab5e1fff96c6c85ac31eb2ea30b271633a095e35 SHA-256: 73bdd491938d64e0879d0de4509ad34c52e53e3e0fd1d0a1bbe3db9fef7e571b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on unknown or suspicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links, suggesting a phishing or redirection scheme. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f803bbedd4---kowabuboxutajomo.pdf In PDF document text
    • http://scandinavia-ex.com/images/blog/file/woruzi.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/96216785007.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/manojepabuwi.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210918071402.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/satidakakufupeze.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/kunofusem.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/53833051967.pdfIn PDF document text
    • http://simoncaulkin.com/images/xorerob.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/4438515382.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/65288826750.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/38682119359.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210910235351.pdfIn PDF document text
    • https://irantruck.ir/data/file/68605089422.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/keduzoforatidiposudebidox.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/besevogema.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/vabedafeduxat.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/75167487675.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/bijexixewi.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/desowugububadezepirusov.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/kuvulomosunepelolo.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/75276891607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=subject+for+sending+a+resumePDF 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_off0000b4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D7 16588 bytes
SHA-256: 674133a4caa745e2123c1b9ff2fd27dd1c995762c2be68c8a827496c73a57b36
font_01_sfnt_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 11216 bytes
SHA-256: bd27764dc7823a75d6eac3025dbef09415b70455b4c39601abe7d16eb9091b82
font_02_sfnt_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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