Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f4c444bdf0fe1e6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 17:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f81ecab3dbd47193abb2c2c719f68225 SHA-1: 978da7f66361c8288cdac32f90c20e5e164742df SHA-256: 2f4c444bdf0fe1e6e3e7a22b886d6db26122b81a9220cc6feea2e7a3b7b7cf18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs, many on disposable hosting and using UTM parameters, suggest a phishing or malware distribution campaign. The PDF structure and embedded links align with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=sony+vegas+13+free PDF link annotation
    • https://lecachet.fr/docs/files/labegezegeluk.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/53030966505.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/52003265715.pdfIn PDF document text
    • http://th-hl.com///upload/files/55522288642.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/kamojuxakijusirukagawi.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/30051542184.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/43318710580.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/48752544552.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/34785701517.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/pidufagibixamazox.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/sapaxamamavode.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/fovonuged.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144274a408e6---21566073612.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/29881253144.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/69844451670.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210903034547.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/21092773238.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/suzubisizimufuwunipamuven.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/lofunitobinetutezeketuro.pdfIn PDF document text
    • http://origo.ws/userfiles/file/54567525069.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/tofufenevozudelexofozeza.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/damez.pdfIn PDF document text
    • http://sarna-zapiekanki.pl/ckfinder/userfiles/files/71827196912.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1fa3bf47a81cf7fd48abc4883a22452f/wevevobusawebiwi.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/41601923173.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_off0000d989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD989 10632 bytes
SHA-256: 4c7b74b2f894ccd0509c02ff844321ce60babb619682fbd8722f6dac8fc792e8
font_01_sfnt_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 17836 bytes
SHA-256: 9dbf99b45754a029fa825264016ce350ae729031c9ae05c329548568f7f94c12
font_02_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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