Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b36acba074a840b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 21:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3acf9a8e37ec9d8831fbc0625f30f213 SHA-1: f502e5db0c06ba0854c23e350ab0904e834d0918 SHA-256: 7b36acba074a840bbffc68239ea25005999747dea78cf31aa8297e379af243e8
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The primary purpose appears to be directing users to these external links, which are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tensoinox.com/userfiles/files/debizefom.pdf In PDF document text
    • https://resonanceacteurs.nl/userfiles/file/92984539560.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/finetizodijepagitusuluven.pdfIn PDF document text
    • http://7serve.org/userfiles/file/20210918162108.pdfIn PDF document text
    • https://alpinashop.bg/files/48136277883.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202109190012553814.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/45732464282.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/sepapozaxegixanujufowut.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/wetewifelezevovuvekege.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341da660bb3---dudogimuverizu.pdfIn PDF document text
    • https://mkontroll.hu/File/xerovalepelajubugelo.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/67051461508.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/xutimorixekirinamozepap.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/34144678927.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3af0a1b62---tivoduwuwezopusijivibusu.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/45686979661.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/widedusudifirojumege.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/fitulenozavipowedi.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/52499811578.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/76986134900.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/pituwuxijojivekidok.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/13910347674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=move+pics+from+gallery+to+sd+cardPDF 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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 11032 bytes
SHA-256: 688db28aa2e97a31da1a459a5d0f54d394b485a34da0e7ceb38ffdf27c693f85
font_01_sfnt_off0000f3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 17596 bytes
SHA-256: 2b42927811e7699839cf844140d23283701e95f9a032c82793674e70b98c8728
font_02_sfnt_off000120cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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