Malicious PDF — malware analysis report

Static analysis result for SHA-256 71755861072b5742…

MALICIOUS

PDF

98.4 KB Created: 2021-09-13 08:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41f716e82e8682f5f5c1f1500baa1b23 SHA-1: 36f05350b766fb6a36a11050e94311056c8b125b SHA-256: 71755861072b574235ba17b87d155f2229eefa32036ea4af476314710f1f6003
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high ML score and ClamAV detection for phishing and trojan activity. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns. No scripts were extracted, but the presence of many external links suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.serenissimaservizi.com/files/posojogaviparadopasawi.pdf In PDF document text
    • http://studiorestagno.eu/userfiles/files/funadapobo.pdfIn PDF document text
    • http://chromavials.com/d/files/lajilekidatu.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/vunisikuzisut.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/63275258572.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7b6093f1---96997796383.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/27006061463.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/mewebitimijuboxekewi.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/viniza.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/nowetebupewivug.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/derozuxuriboxiniz.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///xapodekisoferizo.pdfIn PDF document text
    • http://apvn.info/userfiles/file/35004708617.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/xaduxej.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/96004422698.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/97892420746.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/tagezituwo.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630871358700303314.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/60516853003.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/vawaxuniwi.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/19920526576.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/65138491673.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/74965725227.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/jekofifadawujararusuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=postal+code+ng+pasayPDF 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_off00011619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11619 21000 bytes
SHA-256: 9eadf31bd8985f7585006a26ba37f7d27d6e2a0be09f08ab2fc257f54a8bce96
font_01_sfnt_off00014bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001640b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640B 10612 bytes
SHA-256: b4d57e49e3f1709a2b9de8cda22fca5d287d4d83026bcfba5b6a6df2bd7af58d

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