Malicious PDF — malware analysis report

Static analysis result for SHA-256 002795ca7579a9c0…

MALICIOUS

PDF

69.2 KB Created: 2021-10-04 07:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7ee9b0a3e473997d9b46d94d23335486 SHA-1: a0fd1d393c1bb52b7d4ac786f4ea4b7565cb101e SHA-256: 002795ca7579a9c07f58c29d32cd6d81f52f604b107d752c6be72cafa77f58d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. The presence of numerous external URIs, many hosted on disposable domains and configured with UTM parameters, strongly suggests a phishing or link-farming operation. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/36955160327.pdf In PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/23254935323.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/jigopegatadonuw.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/87577697128.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153bbfd37a44---2432333388.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/kifefonulobovadukuweret.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/10883134133.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/jedat.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/kivobuwojurolugo.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/jekusolagajuvil.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/13327234733.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/rinosusaxuwinuniru.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a290be77d8---nasuv.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/ratimutub.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/paxelag.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/20347109835.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/37760970781.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/49115963545.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/29578415741.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/75070131201.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/mesexowosebedarufulanuxu.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210926025920.pdfIn PDF document text
    • http://fourfoods.com/images/files/11513035285.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=aerial+view+meaningPDF 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_off0000aefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC715 10196 bytes
SHA-256: 9a00f98798b766f450b99524cc5033ad97beaa12804f65ee7b17ac023eaa80ee
font_02_sfnt_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 16404 bytes
SHA-256: 2554a26e4b4bd5e25eba69991ff8b48ce8734d207a44373d18ec7955a6dade2f

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