Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39e326c44ba11d3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 10:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64f2962b2d9c99302502de75d6953261 SHA-1: aa1cbf6dac2ff1c20dcbf1dc357a17ab5bf9b86b SHA-256: c39e326c44ba11d304b5d67b3dfaa92ff97b4ff2093d166c52df69741c3cd398
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://verkaufs-akademie.com/userfiles/file/tidifadomipapin.pdf
    • http://www.addvanceo.info/userfiles/files/nufedosi.pdf
    • https://futurefacesnyc.com/uploads/file/vubuzezazesomo.pdf
    • https://tsydesign.com/userfiles/jws/files/godewavajuvumar.pdf
    • https://dansobentre.net/uploads/file/30853238504.pdf
    • https://asmitahrgroup.com/ckfinder/userfiles/files/dutipakevojojaxezevezun.pdf
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/94787547724.pdf
    • http://mundialimportweb.com/userfiles/file/85736891255.pdf
    • http://cee1968.com/ckfinder/userfiles/files/xonalipepogasokebik.pdf
    • http://rubivina.com/Images_upload/files/zemonetobiwavujixifuludox.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6d4adca03d758870fe08b643fa529980/51291683541.pdf
    • https://ehbo-oostkapelle.nl/userfiles/file/botodelalefudi.pdf
    • http://hattingtoemrerogsnedker.dk/userfiles/file/6498413121.pdf
    • https://hzautomatisering.nl/userfiles/file/32868563105.pdf
    • http://bjxbw.cn/userfiles/file/mefaro.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161431b7fb33dd---meririxozebad.pdf
    • http://velo.hu/UserFiles/file/24737035571.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/10495391471.pdf
    • http://trumoi-khutrung.com/upload/files/jadigonakanij.pdf
    • http://studiolegalebisantis.it/userfiles/files/59822342244.pdf
    • http://gmei.lt/ckfinder/userfiles/files/82396934275.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+you+put+ringtones+on+your+phone
    • 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_off0000d17d.bin
cea7a2033d341dd5d3a508355cb2dad18cdd0d7480d2a57680ee498bb5851652		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 16684 bytes
font_01_sfnt_off0000fcf9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF9 16792 bytes
font_02_sfnt_off00011510.bin
a3d0383eadb7c1cdd3f282b61fae6c017b6eed0e0fa5532b56b6fa7c150fd5e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 10752 bytes

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