Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa30793a1987ac8b…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 14:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b65fd0fe4fe4046b8722690a36a347c SHA-1: b405a73d0455c28114189d654f5453c681d5bfcc SHA-256: aa30793a1987ac8bc8114931da10800c323fb87af070aacea09b5039eca0afb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://ingatlantv.tv/userfiles/files/xopejelegowima.pdf In PDF document text
    • http://tw-jia.com/uploads/files/202109160004451217.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/jonodevanijumototatifi.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/30305657050.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/85950454259.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/10229394088.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/88399137998.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/pakuvujaziputarel.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/54046751196.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-09/21090908473772905774e1vcyv98yh.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/kagadaroxonebogerulevuj.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/gufobepufokufigigajaji.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8d3477471e8f33d534f55f6ad1ceff20/kixipofogeza.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/77680550398.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/81330999233.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/67867515195.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090608225473499.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/kegovoximiximexonera.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/50446115288.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/77429278500.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/56461065128.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/xizebezi.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/morevaxifa.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/dosisuguzigajiluposuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sdk+android+iosPDF 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_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 16896 bytes
SHA-256: 42a28e22e4c81fe7e2735cbf5b452c162a589ef5cedb87678a428ea0c115e40e
font_02_sfnt_off00010b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B97 10132 bytes
SHA-256: 9d89f4b1fadd9274e14a2efc9605f7a74f6c9075955b343887855746fb6b218c