Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b83adf227e56fc…

MALICIOUS

PDF

79.8 KB Created: 2021-02-18 10:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e23b0dc9f3c3f2d79e052ee5945d8e50 SHA-1: 9c97c4c42f3c251ce48f8c151fd2a2bebf90c3db SHA-256: 09b83adf227e56fccf6d3fb5b84a6eb34a73f68029b558f2cd5ccd88ddcf8f18
166 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains invisible links pointing to suspicious domains, including http://securityofusersdevicesonline.site/swift_handbookhqtte.pdf, which is likely intended to trick users into downloading a malicious payload. The PDF also acts as a link farm, directing users to various external sites, some of which are hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://jacksth.ru/wix?keyword=learning+web+app+development+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450038/normal_5ffc0bd29fdcf.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/hVnicgc/muvakelu.pdfIn PDF document text
    • http://com-signto5.xyz/latest_server_list_minecraft_pe_vnt3f9b.pdfIn PDF document text
    • https://cdn.sqhk.co/dedesonor/sfijana/pocket_tanks_download_for_windows_8.pdfIn PDF document text
    • http://kesenirevapovid.iblogger.org/boxupuzesafetuf.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/swift_handbookhqtte.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476751/normal_60074856a4536.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/higc5hd/lock_screen_backgrounds_iphone_wallpaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418972/normal_6019718eadd79.pdfIn PDF document text
    • http://pornbustyvids.com/zasimadosavuzaln643j.pdfIn PDF document text
    • http://waxenotesanil.22web.org/tadetorolugagijewunebasox.pdfIn PDF document text
    • http://xowefew.22web.org/tv_guide_tonight_canberra.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_602c218826bed.pdfIn PDF document text
    • http://capridigi.com/jejizupuzozujuihs5.pdfIn PDF document text
    • http://photoforce.ru/ww1_airwar_para_kaybon65peg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ziriboxemo.epizy.com/ryanair_app_for_ipad.pdfIn PDF document text
    • http://dowijasimenazo.epizy.com/towifaji.pdfIn PDF document text
    • http://zekubegem.epizy.com/mimixetoga.pdfIn PDF document text
    • http://nosikugabuvisal.epizy.com/76719043659.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 5204 bytes
SHA-256: 5d6eb01540a0de8ff20c9f11fa0c3474166cea351fe7cef3466eafafd224d2e9
font_01_sfnt_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 10380 bytes
SHA-256: 6b3ac2e8a3089056c5a36a45713f01c22ba957e10ac151104e55beb73bb37fe0
font_02_sfnt_off000123b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B9 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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