Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f56cac1250fd380…

MALICIOUS

PDF

82.8 KB Created: 2021-09-10 23:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0802b3f240b9733a1ef56776b01d488 SHA-1: d99fb0e56f914fb444837aba6021ffe99a72b557 SHA-256: 9f56cac1250fd3809eb4dc3848f34a82f0d0f4cfd759eb07c47522a9f7989260
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or scam campaign. The PDF structure and the presence of external URIs point towards an attempt to redirect users to malicious sites, likely as part of a spearphishing attack.

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 https://archism.ru/uplcv?utm_term=among+us+friv PDF link annotation
    • https://dijitalsanat.link/upload/files/411361540.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/zafomip.pdfIn PDF document text
    • http://373113.linker.tw/files/58808514093.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/65754295503.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/zokukejujigofuvolip.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/pemuwovagefuw.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/53658140229.pdfIn PDF document text
    • https://linardi.ru/files/file/69082289360.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/tapuvajagugufori.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/64819106559.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/garulevotebemaxamajuxafo.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/mogufapogubopom.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/40100673256.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/59712396592.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/gewozulomiwodukafo.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/jutomejenasenibunudekot.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/72196786953.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161394788cbf1c---86259807662.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/35762797272.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/renonubetivipojojona.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/davaximimebepid.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/venukubaledafajo.pdfIn PDF document text
    • https://2winit.com/Files/files/dulunagoxopamuxijexub.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/devejakevilefepipofakuni.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_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 17180 bytes
SHA-256: 11185b70d4729cb060342666063c8aa45734d1fc0af1d2117deb25b1992f5ad4
font_01_sfnt_off00010e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001264a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264A 10264 bytes
SHA-256: 5f4ea8f075b9e913f8b20825daf90ca8659faeafb2abaf01753c8346a7dee5c1

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