Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9352b0e7de30b8…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 04:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd02b2c4becb3aa37c9ce3b7b8c655c2 SHA-1: 42b0327925abebc812cd9ed0216966cf7d51be20 SHA-256: fb9352b0e7de30b8eeb1d5c938bc208b024c099a5e9d5601f14163eeacc863f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, many on disposable domains, suggesting a phishing or content-scraping lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via the numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://jobsandhi.com/uploaded_files/userfiles/files/1811292190.pdf In PDF document text
    • https://dacola.com/upload/files/68404571968.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/82810203807.pdfIn PDF document text
    • http://humanlitech.com/files/files/bodalufutujugilupij.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/2573055553.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613946b9f09d8---xepunezedufukobevabavutu.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/puzukod.pdfIn PDF document text
    • http://nemalipics.com/51483200244.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/zodafivejafoborej.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/zevelexow.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/rukekumunuvesumeborir.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/39608079105.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/mujexupafipevavodero.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/56681611484.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/96524001059.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/memudofosegidovuvikofivej.pdfIn PDF document text
    • http://oldadmin.k12cart.com/media/files/murobeposixudekar.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/84321603931.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/38587238822.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/31109307865.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/konazimigokela.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/jelopamedemovoberada.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/matagis.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/44655728190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=medal+of+honor+allied+assault+apkPDF 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_off0000c89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89B 17084 bytes
SHA-256: f4877ae2ae3b7a87d1c595c2f080fe96546486a51b5de63b6f778f4e99051465
font_01_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 10780 bytes
SHA-256: 89c33dc535f99e69292e85fec51c7dd3528acfbe6c63d281f209dea9aa1f67c5