Malicious PDF — malware analysis report

Static analysis result for SHA-256 844746c1c94f752d…

MALICIOUS

PDF

73.4 KB Created: 2021-09-16 00:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab2c080c4f75e2c0730cffece0ab4a15 SHA-1: 2ef145a9501396fbb3f06ae5e855fc890e8f1373 SHA-256: 844746c1c94f752d2767e4feb9d6100cb56c65d14c79969bbb2c1300c6ddce09
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to potentially malicious or unknown domains, suggesting a link farm or phishing lure. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating the document's purpose is to redirect users to external sites. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xaydungdonggia.com/app/webroot/files/images/pages/files/8310822547.pdf
    • http://netcentricnj.com/ckfinder/userfiles/files/juvenume.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/43686636541.pdf
    • http://rc-modeller.se/images/file///xunupo.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/40136622809.pdf
    • https://latrinquette.com/upload/editor/file/31104847773.pdf
    • http://advocaatindex.nl/images/uploads/kumabewanusagisobipino.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2f6e9ddd---tofila.pdf
    • http://simoncaulkin.com/images/83598879236.pdf
    • http://jamesandsons.ca/userfiles/file/61442818382.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/movukuvufowidunulinetis.pdf
    • https://dammesliepas.lv/ckfinder/userfiles/files/fewejeme.pdf
    • https://es21sys.com/userfiles/file/wazufu.pdf
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/50508782499.pdf
    • https://zlato-stribro-investice.com/upload/files/65783408295.pdf
    • http://ahxxzx.com/userfiles/202109/file/zujesuxolixosavun.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/lepowumukakad.pdf
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/vipimarunabo.pdf
    • http://heaig.org/editor/ckfinder/userfiles/files/89440660134.pdf
    • https://indirimlipin.com/calisma2/files/uploads/kogabosusatuzoxazozudub.pdf
    • https://csp-pub.com/stockages/files/37896920529.pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/xamumoxivexavijivepoxat.pdf
    • http://vngo-cc.vn/cooker/public/files/73314896118.pdf
    • https://agrocare.ro/ckfinder/userfiles/files/74149642697.pdf
    • https://mysmartedu.com/uploadimages/files/dezejigiwefa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=watch+arrival+123movies
    • 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_off0000bb35.bin
742f54845765632afbe1986ce4ca6e4b5cb1219cd306cfb6631a0fa4e181677b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB35 10796 bytes
font_01_sfnt_off0000d441.bin
c7d3ec8ac1b3853c1fbb651f4aae2ea8e386fb6bc17687f9d60243868fea0f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD441 16848 bytes
font_02_sfnt_off0001001b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 16792 bytes

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