Malicious PDF — malware analysis report

Static analysis result for SHA-256 99cb87c6f9174af4…

MALICIOUS

PDF

97.2 KB Created: 2021-03-16 13:09:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5787355b1608aa76b974a0e706956edf SHA-1: 59cb80cdc593438567361da7f94b8941488498ad SHA-256: 99cb87c6f9174af441e8b82adadb8a0c8fe2b46baf053e2b73c546d07b57b21b
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://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/f815ea62.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://mezovuduw.ru/wix?keyword=return+to+the+isle+of+the+lost+pdf+free+download PDF link annotation
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/f815ea62.pdfIn PDF document text
    • http://marketes.pro/the_book_of_noah_full_moviewce6v.pdfIn PDF document text
    • http://creampiepow.club/a_diamond_as_big_as_the_ritz2g930.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/2hhrvkI/ftd_dementia_signs.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/65057274159hevhh.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/benefits_of_cloud_computing_for_small_business.pdfIn PDF document text
    • https://cdn.sqhk.co/mefivujosawo/ijhfjdp/kutazopar.pdfIn PDF document text
    • https://magenudelekoj.weebly.com/uploads/1/3/5/9/135975171/sibofufe.pdfIn PDF document text
    • https://cdn.sqhk.co/rivinodati/oRjgThh/52085627892.pdfIn PDF document text
    • http://profmaster74.ru/how_to_write_anything_3rd_edition_freeq54a6.pdfIn PDF document text
    • https://nedotumawu.weebly.com/uploads/1/3/4/6/134626041/7557.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/vasipebozezuforasipoge.pdfIn PDF document text
    • http://redpandarecycling.com/amoeba_sisters_video_recap_classification_worksheet_answerst4rvw.pdfIn PDF document text
    • http://kivolugog.mypressonline.com/57417271167.pdfIn PDF document text
    • http://uptodate.site/74417684455hmi92.pdfIn PDF document text
    • http://mscgis.net/zevasipilexm1pg.pdfIn PDF document text
    • http://aduo5.online/video_bts_heartbeat_mv_mp4utwwf.pdfIn PDF document text
    • http://sesalon.xyz/creative_sound_blaster_x-fi_titanium_hd_sound_card7u6qb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00013ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE6 5228 bytes
SHA-256: 58851aa3458553f61cb09b2809279616242cba8c2e39242a94ea2452f5694191
font_01_sfnt_off00014ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBF 12176 bytes
SHA-256: 82aeb9de37991a471f57149cc68f7dcab20947b7d585a03e82ffd1de49811674

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