Malicious PDF — malware analysis report

Static analysis result for SHA-256 a966b07b8ae0aea9…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 16:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c29ca0f596cb68f957339586e3aa5718 SHA-1: a6ac8ba5ac1a6be35c1d1ce4458296da7f8efa11 SHA-256: a966b07b8ae0aea97c4abdfa1247aca39f305213675acbe73ef8e57ab399dfba
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving malicious content. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

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 https://pixomot.ru/uplcv?utm_term=football+manager+hacked+apk PDF link annotation
    • http://writtenmail.com/upload_images/file/95184726310.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/lonavapepojudasukaxifo.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/segigutizetomez.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/subelefifado.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/katiteneziriwuludelexu.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16312284922895.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/98716869911.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/93039163692.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614948c56e9ae---14697776740.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/50619731953.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/rokamizejejejotav.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/zosilufuzabivu.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/tipaxenuj.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/wozow.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/772291958.pdfIn PDF document text
    • http://showpelec.com/data/file/20210921_080016_443.pdfIn PDF document text
    • http://centrons.com/uploaded/file/30622707861343a4384679.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/88209457110.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/wivefiwujovodak.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/68728200149.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/xixawalinu.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/vexenetatonusidujakagewon.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/30372050600.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/33255646551.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/dijasefalolutuvasi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB196 10912 bytes
SHA-256: 2c792452015b5a3bb36adfc4d6c693659ba27de26c832c45f4ccffb56ed7acea
font_01_sfnt_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 14504 bytes
SHA-256: d0803adbec2f07bb031b40367cf2e8beb9a3d8dbf7b26de200e3932bd5f94c5a
font_02_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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