Malicious PDF — malware analysis report

Static analysis result for SHA-256 f907f560cf77d79b…

MALICIOUS

PDF

76.5 KB Created: 2021-09-11 19:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c0d59196ac695df3ec95344fe785e75d SHA-1: f98c470ac5b4c46460875c0b26521365ccbfb875 SHA-256: f907f560cf77d79b6b70b0cbc86a0fe40b62e176604d4f8afed3f3114d0819df
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The presence of numerous embedded URLs pointing to various domains suggests a link farm designed to redirect users to potentially harmful content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights the nature of these links as being on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hungthanhauto.com/luutru/files/89409587729.pdf In PDF document text
    • http://murielbellhomes.com/userfiles/files/zimavuvugozejekugi.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/fifimolesole.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/79335502035.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/57984163044.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133be5fe2939---lenulomafe.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/lebuzesopuvigozuxiba.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/vaxenosuxotodigozalowes.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/sisagabumo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/70399283925.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/tulip.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/tobese.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/kozevidisoxorovosapo.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/kojokokovapesopurawi.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/78540245430.pdfIn PDF document text
    • https://dhesient.com/media/87283279340.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/8080668730.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/3795612404.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/zabozepixivetewuvamunox.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/jarokokogopabagufub.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210902_030047.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/34114922609.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/xudatukesobule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=android+games+mod+apk+downloadPDF 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_off0000c4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FE 10796 bytes
SHA-256: 48e9cce51d312d1a6d6a6f9051d38c37174f958b52141c91b179344b30021d4f
font_01_sfnt_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 18064 bytes
SHA-256: 321a4da149f384c425112953e4cf37d878046f730add0aaea02d32d2b53949b4

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