Malicious PDF — malware analysis report

Static analysis result for SHA-256 d06e9f43070d8909…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 02:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a149ff52fd6191d7ccd18f5f8974701e SHA-1: 8aa038374fa54224527c56ba735a3ee2073311a1 SHA-256: d06e9f43070d8909e39e1e25a97d077367c69b3cf6ea6118ab65e9a8786ed341
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which appear to be part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://crewmak.ru/uplcv?utm_term=unity+android+bluetooth+plugin PDF link annotation
    • http://t-eamplus.de/web/editor/files/97625462257.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/nujadaribudezuker.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/94358014839.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/zisugu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c9ac43071---39792948936.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/3500633497.pdfIn PDF document text
    • http://levotst.com/uploads/files/bijunuti.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/norilurizenimesiv.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/95552394797.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/litasokiro.pdfIn PDF document text
    • http://hiniceshine.com/upload/fofak.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/nufezev.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/10326940159.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/73166823616.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090521510180554.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/gemipufitiwobabajafate.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/86174401878.pdfIn PDF document text
    • https://tsolisp.com/files/file/47734682781.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/76001496628.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/84808511992.pdfIn PDF document text
    • http://ailizia.com/userfiles/8464711280.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/zikuxifazu.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/tamiwalajupuxe.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zositidojo.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/vinefawemafuxefogeba.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_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 10864 bytes
SHA-256: 1ff3a3ab414f8d6d3053668c1b3925ac6d9cb099558369e81708165d3f7e93c2
font_01_sfnt_off00010987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10987 18196 bytes
SHA-256: 3fff1b5a0efa3bbfc9c7a45c903f0877c25a85e492085704797545a39576486e
font_02_sfnt_off0001385d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1385D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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