Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42e3ba9870f6300…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 02:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1b2d1a09a382230c837eea88fdf3db54 SHA-1: e097d5db3f39fc1e4362277e199a0fa0e1d64e04 SHA-256: f42e3ba9870f6300c5f68257790349631aeaeafe4cc2aec9845b226815e61b4c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, indicating a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of 'utm_term=apk+malware+scanner' in one URL suggests a potential lure related to mobile malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://vswet.ru/f/wumugibadimefos.pdf
    • http://immobiliareborghi.com/userfiles/files/58557848390.pdf
    • http://nwatchonline.org/userfiles/file/fapolozizusixi.pdf
    • http://rakkhunnursinghome.com/user_img/files/34980263329.pdf
    • https://efficimm.fr/userfiles/files/96069746004.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/63348391112.pdf
    • http://telegid.tv/userfiles/file/74430845893.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a02d1bfc764f6e9721c5baea9eb43bd7/73959490841.pdf
    • https://fotokeramika.bg/userfiles/file/zamikabarekagujowelu.pdf
    • https://livermore.com/wysiwygfiles/file/67641778314.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/pikatipixigujigagixute.pdf
    • http://gesgo.de/userfiles/file/delukunojufoxukoju.pdf
    • http://liceoadultos.juniorcollege.cl/userfiles/files/texeviwekefovufuvanowugo.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/xigelowovenebus.pdf
    • http://bwemfjhjk.friend-match.com/upload/files/kepifivu.pdf
    • http://covina.crazyrockinsushi.com/uploads/files/lijaporivapukivigek.pdf
    • http://qiuyutv.com/userfiles/files/20210907042302.pdf
    • https://valubil.com/public/uploads/cms_file/cms_files/41985642654.pdf
    • http://knshzj.com/CKEdit/upload/files/luxatepixelagozowuve.pdf
    • http://sistersaviopublicschool.com/userfiles/file/35710299448.pdf
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/58334429342.pdf
    • http://citygclub.com/ckupload/files/25258049970.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/715d4d029546dc7c4855ad2169250244/77916847773.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/99221530311.pdf
    • http://sity-luxe.ru/userfiles/file/fumatolagowovaku.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=apk+malware+scanner
    • 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_off0000d72c.bin
3117d71ccaf69952fef85837316c0043cd17673626dce4a40d500763e12c2ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 10384 bytes
font_01_sfnt_off0000eebc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 16792 bytes
font_02_sfnt_off000106ce.bin
6d4c0fd158caca72218aff87d581fe398a23bc46ff3e11a85c2d8f5435dad156		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106CE 17512 bytes

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