Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ccd85d3ed743feb…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 12:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59ae75d163b38ab5913addba1c865aa9 SHA-1: f06dd96dc96b8e6281a3ad392b8e0629dd90f709 SHA-256: 5ccd85d3ed743febe11d218b45b1b5908ace988b3543ddf7260fd97695bfa51b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. Numerous embedded URLs point to potentially malicious sites, with one identified as a link farm redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://beiwendq.com/data/attachment/file/61404943475.pdf In PDF document text
    • https://theelementrama9.com/userfiles/files/11499914541.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/rivujimere.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/5615140114.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/fugesovamifig.pdfIn PDF document text
    • http://showpelec.com/data/file/20210912_040229_823.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/junakoda.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/watifazezilugutejafakiped.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/57038799562.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/69343883364.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lavuf.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/letitis.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161362c732bd60---fidovalofi.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/lurobenaxisivij.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/71584478054.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d1b2aa230---xirolute.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/wirivavora.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/mokitup.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/zawala.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/78187004505.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/46793697247.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/34109554862.pdfIn PDF document text
    • http://sudeoksa.com/userfiles/file/20210914051953.pdfIn PDF document text
    • http://fabriziochessa.it/userfiles/file/71619542958.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/fogepajixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=redmi+note+10+pro+problemsPDF 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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 18164 bytes
SHA-256: 9c587016c19427ff69abb1d4130346374caad007b203aa115c0f808616f2bf42
font_01_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 10748 bytes
SHA-256: b90543b0de7d2727aad41e641b9139c4b194f073469710bb568279087d64e5d4