Malicious PDF — malware analysis report

Static analysis result for SHA-256 15be32be4a0c8f8f…

MALICIOUS

PDF

74.5 KB Created: 2021-03-24 02:04:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 84648a307f7a17f48ac6373870f5cc4f SHA-1: c257b5df4af33b1dc4712f54b7f3c27a02e78e86 SHA-256: 15be32be4a0c8f8f9c72c9fe8b01ef0ac2d6d67ecbdffb5c7aa01993f47b5fb7
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses brand-impersonation credential phishing. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/386629.pdf.
  • 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://vilenefex.ru/wix?keyword=discrete+and+continuous+data+worksheet+pdf PDF link annotation
    • http://uabiomanix.xyz/exam_cram_a_practice_questionsdmkv1.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/386629.pdfIn PDF document text
    • https://lusebedadejaxid.weebly.com/uploads/1/3/1/4/131407110/58b72fac0c8591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_6043dc1b830f9.pdfIn PDF document text
    • http://belldiscount.ru/roadmaster_granite_peak_womens_mountain_bike_26_wheels_black3idls.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/8786102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420031/normal_5feb3fde7b926.pdfIn PDF document text
    • http://fb-pageunderreview.com/anbe_sivam_song_isaiminih4eqj.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/pokomojo.pdfIn PDF document text
    • http://nigasheff.xyz/toefl_reading_comprehensionl6i97.pdfIn PDF document text
    • http://flowerport.store/liar_lyrics_camila_cabellotm0df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e6be9d-a370-4436-81da-2c1a8f32a3cb/pidabijeg.pdfIn PDF document text
    • https://c5c1e25b-3ca9-4f8f-aecb-0ee3b29cb37b.filesusr.com/ugd/f4fe7b_6581d5e6df97458db7afd3135a77dd12.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_915e82c0c18b4c6d8a4f3acf5b850c72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ff749d2-cb6d-4d0f-ba0d-32224f60daaf/how_to_change_code_on_schlage_lock_fe575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51ab163a-0e8e-4484-9345-0edd8c4164fd/baofeng_uv-5r_plus_programming_chirp.pdfIn PDF document text
    • https://d8aee3b0-83ea-4a0d-b8f9-524a85b41d10.filesusr.com/ugd/105b34_90e070ae7aef428b8932173d638ec62d.pdf?index=trueIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_80551d40756f40c0b06f64f340e0acd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3036653e-adfb-456e-92cf-da2946daa6a5/damabexagotedojugurem.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 5368 bytes
SHA-256: f5c67470694462601b07b91a9f892184788443dff022cfee187d3c0eef56e4a3
font_01_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 11088 bytes
SHA-256: c36da6c1b38009adf3922f0f5391f6cdd516291bc97b37dbbc54336aea3b6a5e