Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b0e1afef385a39…

MALICIOUS

PDF

84.5 KB Created: 2021-09-08 15:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 43ff887872bcba18e4d9c2fcabcc5e3f SHA-1: 2389310f0ff3989c59e872cc8735ad54be4abba4 SHA-256: c6b0e1afef385a39f60ff12768210ad663fc70ed7c9a3f0070b20d62d4adc145
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or spamming campaign. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=visual+acuity+snellen+chart+pdf PDF link annotation
    • http://ondrejkocar.cz/img/file/dowajimipu.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/40373959431.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021971659161342.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/peresabuzori.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/80170240108.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/wajeb.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/48730187843.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a05f56646---vixesukejetokari.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/zogevamevofibovolebovanez.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/bomonewivedon.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/86582041124.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/56377020675.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/nabekedajabiwaloza.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/jebijofujedagodipetadab.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/devezurezime.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/vapenivob.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/rigiwow.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/46628431870.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/jilulug.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/renepeloxovapamud.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/fodofoferisejebofoxomagif.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/judavuto.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/738076628.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_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA28 18924 bytes
SHA-256: 4df261ceb6e992461a15317a33a429cb5da638b5915233b52a3fa260852581f1
font_02_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 10780 bytes
SHA-256: d98080b6842fe169085a93eaddf9949f12c85ad5dc8e81ac9a30742165e747a5

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