Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c8a5ab49a27919…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 00:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9520d51fce49e843b4866732c83dbfcc SHA-1: e16a4ee5d1b8f943642e338ef81d07ba93c4fc00 SHA-256: a8c8a5ab49a27919e5fd639ae1d4b3f1b3e85a6664aa293661cae4f865a692da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to PDF files on various domains, suggesting a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

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://dentalclinicbangalore.com/uploads/52068065635.pdf In PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/94461714898.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/ruvitalimazukew.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/65434853433.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/65676095564.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109041137558373.pdfIn PDF document text
    • http://annabarons.com/files/files/lotobojuwevasumolonamasi.pdfIn PDF document text
    • http://cocoal.com/uploads/file/80666382504.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/71078158664.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/wujupuvumijivalubifapuvu.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/64421773084.pdfIn PDF document text
    • http://julianina.de/upload/file/99251644232.pdfIn PDF document text
    • http://thietbibepnhahang.net/media/files/ganopagesazapasupepode.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109080027089029.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/sadoxidarubiwumojabevevuz.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/84194985077.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210915_0329D3E85E8663A0.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f7ae19bc3---8401692530.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/kezutekupiginatezak.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16149f8976f9fc---7371938779.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/95538167189.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/gipuvipo.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/78197823234.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/derelosifegimoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=game+switch+terbaik+2020PDF link annotation
    • 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_off0000b17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17E 10824 bytes
SHA-256: 2568cd15c615c861455dcc642346f0f4f6f61e2103907d85f5b09cd02de915b7
font_01_sfnt_off0000caa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA0 14896 bytes
SHA-256: 6358aa25bcc57cd4dcbd629797d2cc940487119aaceca4adbb067279af19e8d7
font_02_sfnt_off0000effe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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