Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e0ef6979c266a2…

MALICIOUS

PDF

79.3 KB Created: 2021-09-10 18:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62ea9645e5c6a213d4be4aa4d18a2382 SHA-1: 33e96bcdfa30a40e61dfaf805e7362e91c8248a7 SHA-256: d3e0ef6979c266a2777cf0083e2f3ef954556d3880b4a29895fb324fe160b7fe
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a trojanized payload. The presence of a link farm with disposable hosting and UTM parameters further supports a malicious lure.

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 http://lamorenj.com/userfiles/files/limusupajavufajifitegesuf.pdf In PDF document text
    • http://studiosiriosrl.it/userfiles/files/75063025795.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e2fccd85e---zoxenobudofexejevora.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/vegajuposiwedajamu.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/38999290530.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/14508951775.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///lesadefefumuzimup.pdfIn PDF document text
    • https://ka-base.no/images_students/files/sejazowobezewawilazilas.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/66692263319.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/56558179758.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/30872134028.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/86445161867.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/watubu.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/5600925760.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/bivizozis.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/66696944709.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/64753726577.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/ninokugilifafupabepotak.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/34812506330.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/96948415264.pdfIn PDF document text
    • https://ambalatender.com/upload/files/48116250057.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/87147915882.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613130c0b7d53---jogefubajujuveg.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/fivasedimelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+download+snaptube+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://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_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 10604 bytes
SHA-256: 58c688920983950ea0392af22b225462dce02d784cb3c45c45ea91378485b763
font_01_sfnt_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 17764 bytes
SHA-256: 72cca3fda1ec8394493a97e531036fa88a4cc2318e2046f001b64e8237c8c787
font_02_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1