Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90938e458fb0bee…

MALICIOUS

PDF

85.4 KB Created: 2021-09-14 00:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 603d5367179f9f266569be440ff2a3a5 SHA-1: 29c91bbbd0c173b3041af00cbea0be78542561ab SHA-256: e90938e458fb0bee12d3b6fa89980e425c36c702af0ce373674661c03f7a8550
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=index+of+vampire+diaries+season+6 PDF link annotation
    • http://ya-ke.cn/admin/upload/36340248748.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/majalazonunezija.pdfIn PDF document text
    • https://majubesar.info/contents/files/zegagokifidagelo.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/50370688781.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fabc0c880a---52463045536.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/burakuzug.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/bufolo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133492351abf---tisijulolasudodazomuwago.pdfIn PDF document text
    • https://auto826.com/uploads/files/jetik.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/49960949259.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/medezusuf.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/gederad.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/1804366095.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/xegobibig.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109020559533803.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/11450867705.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/suluwekoxo.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/nekixabudup.pdfIn PDF document text
    • https://ccskin.com/geektic/files/43252306671.pdfIn PDF document text
    • http://bptramptour.pl/files/file/42878933529.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/18464206521.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/24784733630.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 18584 bytes
SHA-256: 17d45089992f5392e8b1a6bb3c3acb28cfd294079cbe2dff89969b27b4736e1b
font_01_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 10800 bytes
SHA-256: 8313da9d42456ee07397391d5c4769a556c1090ff012b134dff3e71865b889dd
font_02_sfnt_off0001302f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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