Malicious PDF — malware analysis report

Static analysis result for SHA-256 549b575224401edc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 23:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e226352e30dac200f566cff4630ee727 SHA-1: 95911594605ad2160218ac7fb3ee9892876c20bf SHA-256: 549b575224401edc1b19250b9784eff28e383f5e76610074afdb6e8363eefcf3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=what+is+fashion+promotion
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1f0e6e6b---36912637232.pdf
    • https://echipamente-scule.ro/userfiles/file/vesigima.pdf
    • https://seltec.io/images/uploads/files/rixobepaki.pdf
    • http://selidbe-beograd.info/files/faratumegu.pdf
    • http://viprealestatebrokers.com/userfiles/files/9905467822.pdf
    • http://yds-wcv.jp/free_images/files/sivikotibeda.pdf
    • https://bilalyapidekorasyon.com/userfiles/file/tebirurudedudowutorekuje.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/xamom.pdf
    • http://laiyi-art.com/userfiles/file/nobupexevakewedepafepe.pdf
    • http://hk-keber.de/images/file/vavizevare.pdf
    • https://art4you.sk/editor_uploads/system/files/misutiwabi.pdf
    • http://riccaassociati.eu/userfiles/files/vejitoratilowuluwoke.pdf
    • http://naturestuff.nl/siteimages/file/51398517031.pdf
    • http://porpora.group/imagenes/imagenes_contenidos///gebiri.pdf
    • http://bagiez.com/userfiles/file/13089469556.pdf
    • http://creptiles.dk/userfiles/file/juvawegopuzorizo.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/11086238176131877bc2d62.pdf
    • https://osikovo.eu/webroot/img/content/files/28775109086.pdf
    • https://okud-istra.hr/userfiles/file/wudapididonugoziwavasu.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/wapisasojekibukamap.pdf
    • http://vmkmsz.hu/userfiles/file/44474076864.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/612fbe4f5de9d4abf8d1753e66a80459/61615386145.pdf
    • http://cokhitienvuong.com/uploads/files/47443342278.pdf
    • http://campingwithconvenience.com/files/files/45194050248.pdf
    • http://didongsinhvien.com/upload/files/vipikevutogaliz.pdf
    • http://e1pl2.nazwa.pl/busy/fotki/file/80635315982.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_off0000da93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 16792 bytes
font_01_sfnt_off0000f2a5.bin
d1e43dae6f6f7f328ca41be36592a7ec297847afd141f3582f75e3c7bd57b739		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 18216 bytes
font_02_sfnt_off000121c4.bin
3792d1d0e4ec410b4ec7622104b9b67a821aa9795d8b2acb037e8ce3583ea2cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C4 10440 bytes

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