Malicious PDF — malware analysis report

Static analysis result for SHA-256 b663f5b6a136e3ff…

MALICIOUS

PDF

79.4 KB Created: 2021-09-10 15:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 789015c4f1a06c6cdab27f2e7d73fe60 SHA-1: dd6527e9fff37192c08b13a5c84250228e923202 SHA-256: b663f5b6a136e3ff72457b60cac96346e80f6441a4f30a68455367474b6a2b51
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, including one pointing to 'garglob.ru' which is likely part of a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=cutting+edge+upper+intermediate+teacher%27s+book+pdf PDF link annotation
    • http://huile-de-nigelle.info/userfiles/file/9203111493.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/95179861201.pdfIn PDF document text
    • https://capecoralliving.com/media/file/36738451263.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/jipofobixixawiruwuge.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/lupewuwiboguva.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/38106900402.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3d4d2065---juzaxanosoxiduporanel.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/kamazivurapajat.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/31527263520.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/riwalajojunof.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/53368491056.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/54489013598.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/26574982290.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/96966640981.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/sazemosavokibemime.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/juwamudadufo.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/gupolemiwiduporile.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/fepexosejaz.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/82746149825.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/34401548949.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/tufex.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/22682040288.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_off0000d2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFC 16192 bytes
SHA-256: d7f5f5c37d7ac9c30502bb7b485cff518781e2612d79ddbef37f7122e8abfff8
font_02_sfnt_off00011518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11518 11420 bytes
SHA-256: 7fd70749787f343dae6c2e93532a122f7a6f927034f087a782341d117869897b

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