Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b7cec0e2078885…

MALICIOUS

PDF

83.5 KB Created: 2021-09-11 07:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9137aad7995b392253ececeddb1e3dd5 SHA-1: 3d889aa926ba2f30c159a215c8e18b3f963fbff7 SHA-256: e7b7cec0e207888585b752f4bec73355a16ea88368dc2ce1b79ff0ddde1f7f7f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous external URLs are embedded, many pointing to potentially disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tradegateindia.com/userfiles/file/3648232426.pdf In PDF document text
    • https://www.naabelectric.com/userfiles/files/44577014999.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/xurowobadesa.pdfIn PDF document text
    • http://alvitraders.com/files/15168384711.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/xalugag.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327c8c971a9---jakatobekerabavikume.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/38233468673.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/15973145606.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/50436377831.pdfIn PDF document text
    • http://rentaruedas.com/files/others/40668431678.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136787ead1c4---32876904748.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/20493513897.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/wivum.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/78586841091.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/96244121374.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/71803712912.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/62992636831.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/relobabetotexetutalumupot.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/fivalupidopuf.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/bejetarom.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/xobatusajugud.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/82695098958.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/43524760633.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/zikelin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=apk+the+road+driverPDF 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_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 18008 bytes
SHA-256: 4c2358d93c14d8ccf1c7d715c1a3ec4bd698f7cec3103feb7cd48e489ad5789d
font_01_sfnt_off00011148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001295f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295F 10312 bytes
SHA-256: a3945cdd811037d349642e3d7c9196e9325d266d7a128a159d5d3d746c84841f