Malicious PDF — malware analysis report

Static analysis result for SHA-256 0edf7c4250370771…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 22:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a89f93234e02cf2691007b52952a24d6 SHA-1: 110d9754fef3e4907507a58f9f924e1e774021cf SHA-256: 0edf7c42503707710f4b7e6d02e63056bd50017562434fd03ddac52f56c115fe
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Static analysis revealed a high number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. The presence of numerous PDF_URI and PDF_RANDOM_URL_LINK heuristics supports the conclusion that the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://pixomot.ru/uplcv?utm_term=download+mp4+downloader+apk PDF link annotation
    • https://relaxbotanika.cz/ckfinder/userfiles/files/tipex.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/89024450018.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/gefojofamamelo.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/mezonegimavivegoku.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/kodixiw.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/xadadajuvarifoloradewij.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/lasunezujuvilonowe.pdfIn PDF document text
    • http://jainfarms.com/uploads/zimukavefinele.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/24629915414.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/jisivobubef.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/97630338506.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/10758406903.pdfIn PDF document text
    • https://protrialse.eu/files/files/palelabigujelopujevogore.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/41430706166.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/97480953783.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091001575473499.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/fadezafik.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323cc9eee0c---kepuxodojeluvopibide.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d740de71817bf39305629ea1a039f0be/bigikefebotafidimiwugeg.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/95505550968.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/ziraforuretaxusojenologos.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/47993108201.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/nedasunodonejikofan.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/7319204410.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/12465134586.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/radobofuf.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109092055399963.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/23215499226.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_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 18268 bytes
SHA-256: 2a401bc04087668350d0e4f7c0a2cb10e07bf38428bbb8e02829c89983ab27b1
font_01_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 10452 bytes
SHA-256: 5e12b417ea12ccd7e35e90ffe36c6247de3c784e3626f33c3fdcd8c711982e70
font_02_sfnt_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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