Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f95fe1f39f15cc9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 05:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 25b6dc8a9b60c11d231bf2a2ee33f79f SHA-1: b5ffb8af21aa6837f01f8244ee7314b3df3e9340 SHA-256: 1f95fe1f39f15cc92acca0390daa3ade2ec80710cecaf4de068f2e9ca18ae472
154 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The presence of embedded JavaScript and external URIs suggests an attempt to exploit vulnerabilities or redirect the user. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a fraudulent number for fake support or to resolve a fabricated issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://studiozoppini.com/userfiles/files/21935862554.pdf In PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/44567302024.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/lewukezixaloned.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/tinilewajudadajaje.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/pirexisa.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/99387661108.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/33121638385.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/62372042622.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/35247430746.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/xidevunoxurunasef.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/80879619376.pdfIn PDF document text
    • https://aedwea.com/upload/foto/silapixed.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/sawamodu.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/sagimolopopawan.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/53246592119.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/90774124401.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/91514722019.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/sobutuxobi.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/fijozogoxorifajudagage.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/90675558234.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/96011990554.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=quel+antivirus+pour+android+choisirPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/gamobabulokotu.pdfIn PDF document text
    • 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_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10836 bytes
SHA-256: c9eefd1481602e9bb5d854929725f41a5e4b16fad6ffefdc25034a0bdd79bfc4
font_02_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 18880 bytes
SHA-256: 9d48d2fddf98782cfab5a5bd4c2096007e5d6f748fe454f20b47b682e0584b6d