Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82ca13f2e951a20…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 17:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e49cfa43c37f338c702d8513a600915 SHA-1: 1be22ce1a009491a75298922c0b43d9a950369ba SHA-256: f82ca13f2e951a20356525e9e51cc31b5cbaa582141c16441049e9d4fcfd1dac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a strong intent to redirect users to potentially harmful sites. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://sevenhillsgroup.net/ckfinder/userfiles/files/27044201142.pdf In PDF document text
    • http://tincorner.vn/uploads/files/denewadivesetexatodek.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/mezuzaxi.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/2670744368.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/kulimij.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/muwuvopafevipit.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/fuwafozopezakenuxoj.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/2205730547.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/99534023732.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/xemun.pdfIn PDF document text
    • https://www.confirmedtour.com/files/zitexawepilivetuk.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/1362004840.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1dddbf42d---18403602728.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/177083955613dc2ab2ec58.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/jabuwilojipibamaborimi.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/motawavofujonune.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/rofedo.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/23278498570.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/83899774796.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd08670fae---89846861026.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/86993464008.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/rujeruxowi.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/zojepuruk.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/fugulam.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/84701321398.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/88799946575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=free+robux+generator+no+verification+2021PDF 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_off0000d758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD758 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 10976 bytes
SHA-256: 0cd06d070767ff104ed4418a942bb2b23de8cf5e43aeeef4636238d47ebd4843
font_02_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 17252 bytes
SHA-256: 2b9f3374ed66963c7add8490b2bcffe29b1b386512e27c2a4de118808af21395