Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf20400a2435e86…

MALICIOUS

PDF

69.4 KB Created: 2021-10-02 02:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf89757ef648c0fb8274f17fbf6b1d35 SHA-1: bbfa48b7103d5d6181eae380aab77918984429a6 SHA-256: cdf20400a2435e868584c82a573805ded1bc625d1b2e97f852145baf0a4b8033
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming operation. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL distribution indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://ketchas.ru/uplcv?utm_term=musik+kostenlos+von+youtube+downloaden+android
    • http://www.abitacolointerni.it/newsletter/file/kevemuwoxage.pdf
    • http://shoreluxurylimos.com/userfiles/files/92523188481.pdf
    • https://pima-alarms.eu/slicice/file/womewam.pdf
    • http://aircond.md/upload_fck/file/dojawuzivepetaj.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pt1cudkqb2e1c2t0pah37jfjnf/9342389284.pdf
    • https://fo-prefectures.com/pages/files/jizagesalivafuladasazuxe.pdf
    • https://girisimhaber.com/uploads/file/51893406494.pdf
    • http://efrex.cz/files/file/76538416687.pdf
    • https://rugsinc.in/UserFiles/files/gerimowaga.pdf
    • http://temdientu.vn/images/ckeditor/files/togifaxikaw.pdf
    • http://studiomanzetti.it/userfiles/files/68783997124.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/xuzazogo.pdf
    • https://glbtrader.com/userfiles/file/kipapowizikunipapoji.pdf
    • https://kristinanamaste.eu/files/35719046728.pdf
    • http://hosungtour.net/FileData/ckfinder/files/20210909_F04FCBDE3DC3E481.pdf
    • http://tomaszfilipczak.pl/userfiles/file/buwuseluz.pdf
    • https://kfmaccounting.com/webroot/img/content/files/47782831528.pdf
    • https://xenang-mitsubishi.com/fckupload/file/wugere.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/gotudibufajuwanezopini.pdf
    • http://lechioutdoor.com/userfiles/file/pafulezibut.pdf
    • http://box8websites.com/ckfinder/userfiles/files/3864179949.pdf
    • http://abwlondonblvd.com/uploads/files/21062912787.pdf
    • https://rt9.rspo.org/ckfinder/userfiles/files/64719416243.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adca.bin
c50ac99d0bc7713c27fe06911558bdab045f2a9b60ff271a51a9bfdeb7bdc46e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADCA 15284 bytes
font_01_sfnt_off0000d4a8.bin
a5f3005f484079cea997e49b0666c95c155b4113d5057a64fd239fa3c8f21032		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A8 10832 bytes
font_02_sfnt_off0000ede4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE4 16792 bytes

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