Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d1bd06882bf8bf…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 09:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 432ac5c5bf631a77849cc5b72ce10f4e SHA-1: c8c3966b8719e46f4fea671bb3e7f5cdf5bf6871 SHA-256: a7d1bd06882bf8bf52c35ba3796c219a1a2140777f2ecd38fce25f0f9ce9dcb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with known malicious document delivery mechanisms.

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://serramentisiciliano.it/userfiles/files/zuzerujoxivixegejonosa.pdf
    • http://benhvienlaptop.biz/userfiles/file/zixuxewipetoso.pdf
    • https://deltagroup.bg/uploads/file/vaveludixusokow.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/63600074938.pdf
    • https://ans5680.preneed91.com/upload/files/52896597533.pdf
    • http://giga.sk/storage/file/nivuf.pdf
    • http://gr-chem.com/upload/files/53040158164.pdf
    • http://cedule-plachty.cz/files/file/memifo.pdf
    • http://plechotice.sk/tmp/file/befak.pdf
    • http://megat.pl/uploaded/fck_files/file/66351155316.pdf
    • https://invision.buzyhub.com/files/zutodibagapegaguzikuwini.pdf
    • https://sportuna.be/ckfinder/userfiles/files/ninekotijonurebelisiwi.pdf
    • http://angelascanu.it/uploads/file/83039018298.pdf
    • http://cjmfgxfollow.morefriendship.com/upload/files/vukopawelix.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/55700949267.pdf
    • http://logicamail.it/draft/media/jesojinimoxab.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tevexiw.pdf
    • http://karate-talence.com/newsite/userfiles/files/gudogonenorawesuni.pdf
    • http://mhinflatable.com/upload/file/togexobawoxopawaxuvarod.pdf
    • https://faktxeber.ru/resimler/files/22370907172.pdf
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/sivafisojatafog.pdf
    • http://nieruchomosciklodzko.pl/files/file/vetojemomusu.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/5f587b9a07ed652a2afbfe5c94dca236/39757654116.pdf
    • http://djapm.com/userfiles/file/wetenobimiparaxap.pdf
    • http://msdoubrava.cz/foto/images/file/roziwugifisiwesaxulip.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sketchbook+draw+and+paint+pro+apk
    • 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_off0000b2e3.bin
8d10930614e5676e6472e2bcdb8bb509db2dbb0607e74f1c540be3a65c249dca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E3 10788 bytes
font_01_sfnt_off0000cb89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB89 16792 bytes
font_02_sfnt_off0000e39b.bin
82d0318aa2db629bac64900213b6f2e2056418ee6596106a8842df09b2290659		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 14948 bytes

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