Malicious PDF — malware analysis report

Static analysis result for SHA-256 754ced3e3f5dad39…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 10:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cf60604348f0948c29a49de86512646 SHA-1: b504cdc218d3366dec926e6ddbf0561b80d5bd33 SHA-256: 754ced3e3f5dad39389cc56eece804df3f78fc8b3c691d8f05024ed9a090df04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to various domains, many of which are unknown or potentially disposable. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a deliberate attempt to obscure the true destination through redirects and a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://postelezmasivu-zlin.cz/ckfinder/userfiles/files/29486594430.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/n5uj2cvh4dr7gt7osi37ua3pg5/99565292008.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/xakubuk.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/38134452853.pdfIn PDF document text
    • https://claudiodituri.it/uploads/99557763284.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210917214625.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/ruvofux.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/46067205515.pdfIn PDF document text
    • https://vzglavniki.net/data/file/tutevidutem.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/susepidetilin.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/gubutosijadeloki.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/fosoloromamonufadodopaz.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/76251089705.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/70098862888.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/vasawiretuziri.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-19/20210919085620830275.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/6157720261.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/70188754827.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/86597493224.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/sofexaledakiroduleba.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/febakasezinovikek.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/bedogexiperolaxakar.pdfIn PDF document text
    • http://frchem.cn/upload/files/bojadoziligemow.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/goxosafavisojelurad.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142196c06f86---47315203864.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=adobe+acrobat+pro+androidPDF 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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 19880 bytes
SHA-256: 86ca2e2e300c4ab754d7b1aea69b21659f5d02fbd3118a095699e62b48447727
font_02_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 10416 bytes
SHA-256: 703d5369f7e238c20453035affe0759c0bf14c6eaaadb60ebc92dbe575b89a51