Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c1c7736b571a50…

MALICIOUS

PDF

73.8 KB Created: 2021-09-09 23:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d90c289e1e6a86177a8f847f304de3d SHA-1: 5275f78299b5b70fc9b44bb148bac86a41312738 SHA-256: e8c1c7736b571a503fad10139e8503be70e155fead7bde503b9d5f39d334932c
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs pointing to disposable hosting, many of which are structured as link farms. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. The embedded JavaScript likely facilitates the redirection to these malicious URLs, aiming to trick users into downloading malware or engaging in phishing activities. The ClamAV detection and ML classifier further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://cructi.ru/uplcv?utm_term=fifa+20+ppsspp+download+100mb PDF link annotation
    • http://hyunsin.net/userfiles/file/zitipemezumineguposa.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/64060810396.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/jibesasonalud.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/janofokolinajeluwa.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/zupezidotixix.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/52100905259.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/pesexugitezebuto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a1a98b7fd---71450890075.pdfIn PDF document text
    • https://swiz.eu/files/editor/97198229670.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/30382237609.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/zejafobavemagarivobota.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/bavenixodajedijoximatexa.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/riwinukanizog.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/mulofologukamur.pdfIn PDF document text
    • http://furniture83.com/upload/files/vapopinefotosuvapovewov.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/ligikerowuxal.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/24589828679.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/52927573055.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/niludaramimufarogi.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/77194525869.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/54184732477.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA12 10828 bytes
SHA-256: 6dde07f473046c107b49f691404642dbb2096cadee2811a551b24d231ef651f7
font_01_sfnt_off0000d2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 17996 bytes
SHA-256: b7ba37e1fab44421a9ec0cbcd1c7ee8d14e331f33852cfd05a2459cc593f165b

Open this report in the interactive analyzer, or submit your own file for analysis.