Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd98d944121e3f83…

MALICIOUS

PDF

81.5 KB Created: 2021-09-23 21:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6a9080112dcc7aa8fdd6933b30662106 SHA-1: 5673a7063937ba27a673f8f3247b98cc883e7a4e SHA-256: fd98d944121e3f832cf9e016a67883edda53fecd5f1f254f2eab54e8b5477544
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=upcoming+pokemon+games+for+android PDF link annotation
    • https://wojczak.pl/userfiles/file/88536776865.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210909213252.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/dasojineru.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/62495173968.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/70406208345.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/78538737285.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/86298135796.pdfIn PDF document text
    • http://standdominica.org/files/files/noxatixikel.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/29693543023.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/zekamutanujijadetaxi.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/54141787936.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/74982775921.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/15818765659.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/vologisajugu.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/donavarug.pdfIn PDF document text
    • http://renknh.com/ckupload/files/58170357794.pdfIn PDF document text
    • http://lumieye.com/userData/ebizro_board/file/4325732815.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/32866279550.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/gunulidujobabowuvuvisap.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210922012852.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/wupovatarufarimasimotajuk.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/37144795233.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/6910817920.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_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E0 10916 bytes
SHA-256: e637aa0552f46f61de13354866db27b5f44b33df9e9058c5669beefc0871f35f
font_02_sfnt_off00010ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE2 17736 bytes
SHA-256: ae3dcab95448381414c4aa20d8917012a960c5f4842ada9a1beaf4a72426788b

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