Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb88fd673570dd1d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 18:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 89987da96cae00af41b5a05beac78356 SHA-1: f3e6a564cb3a9b326f47df72a91ab7e5134c7a38 SHA-256: bb88fd673570dd1db46c7d3a0fe134bce2d40c7cb958e2da01db5a508efeca1b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the sheer volume of URLs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=superuser+su+zip PDF link annotation
    • http://sirindhorn.net/upload/File/56121751987.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/lavako.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/mobusewisizadebu.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/96633904944.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/35592555931.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/pitinazev.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/dokerit.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///64315928394.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/rigejolaguno.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/paduxez.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/gapugowijidabuxipikap.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325ac4d9ce0---74527681003.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/66237123174.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/72589122645.pdfIn PDF document text
    • http://scpt.it/userfiles/files/tekubefuw.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/77355110513.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/27720820638.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/kuponavozomas.pdfIn PDF document text
    • http://skupka54.ru/upload/m/tizenibofizorosepuxa.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/1027257354.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/75233155260.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/diwokorowukudukil.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/xokixudibejusigu.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/41501103912.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/35369605391.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_off0000b8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EE 17460 bytes
SHA-256: 0dc7b13d0bf63e5121bfc88cb795dfb11585475b45bdf76ac0fac7e96f5e9d72
font_01_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 9952 bytes
SHA-256: 3f22b8bf31bb26325d679338ed23a35a434c50195b5ce018874d68da87614161
font_02_sfnt_off0000fc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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