Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2b9ae2271e99d8…

MALICIOUS

PDF

69.7 KB Created: 2021-09-21 00:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85aa7c515a84225329c47ab67c8e4a74 SHA-1: 1a0595258f358d00a450e027a9962a5813e743f5 SHA-256: 7b2b9ae2271e99d857c720c670ca92654b0ae8e7949b8f2e375baa237ce43173
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to disposable domains and are associated with a link farm heuristic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of external URIs and the link farm nature suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=windows+10+pdf+to+word
    • https://trinityautorepairs.com/uploads/files/1069214370.pdf
    • http://dermatologomiguelgallego.com/miguel/fck/file/70595275209.pdf
    • http://webbuilders.com/files/file/93172011455.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b8068ae44ee1b8bed91d236c174eb67f/sevekivuteruv.pdf
    • http://airsoft1.ro/files/file/tuvinizuzibomomota.pdf
    • http://ipost.mn/ckfinder/userfiles/files/jotaw.pdf
    • https://alkirbilaw.com/userfiles/files/vifakofavaxizuxi.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/karuzelikor.pdf
    • https://principesgs.com/userfiles/file/11981197093.pdf
    • http://tw-echen.com/uploads/files/202109050019077929.pdf
    • http://onlinemidias.com/ckfinder/userfiles/files/vifutupobitiporunazep.pdf
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/jefakufesuwegu.pdf
    • https://felicityokolo.com/file/41123570163.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/dazikefowovaboto.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pulinopejini.pdf
    • https://akapacha.com/userfiles/file/28032000166.pdf
    • https://namphuctourist.com/userfiles/file/wonokosamarowezuwobu.pdf
    • http://thevalleytrader.com/files/perewofifusaxejozexasi.pdf
    • http://sk-uralstroy.ru/uploads/files/fipudofekaxekaliniron.pdf
    • http://www.dr.schure.net/ckfinder/userfiles/files/32952021537.pdf
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/36194379975.pdf
    • http://citygclub.com/ckupload/files/zotetekigumulebugo.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_off0000b149.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 16792 bytes
font_01_sfnt_off0000c95b.bin
14e26b0a324571ea78204cee81e9d875f1b4c2392e35c3d49c40d084febe069d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC95B 15780 bytes
font_02_sfnt_off0000f151.bin
0f0fb2f48d8107738368b05d0049d0432c2d555d25180a0c01da63cef3062cb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 10404 bytes

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