Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48572ad1e690de7…

MALICIOUS

PDF

79.1 KB Created: 2021-03-03 03:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 423ace56ddaf7f15560fa4077f180fa7 SHA-1: 9ba1f775ca26768d1aaa7ae17d16f8842b6fa1dc SHA-256: b48572ad1e690de76d01d94775e8c1adb18aa8e001cc6c3372873d7447cdd20f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 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://xajibur.ru/wix?keyword=harry+potter+school+supplies+diy PDF link annotation
    • http://fastpysystem.online/photo_studio_photo_video1eabw.pdfIn PDF document text
    • http://pressit.fun/stock_market_news_app_for_androidxwerh.pdfIn PDF document text
    • http://azakalaza3.xyz/gijeputudegofoxajubadubimwnhvt.pdfIn PDF document text
    • http://naturebiolog.fun/25441155762mvf92.pdfIn PDF document text
    • https://vofaxarexokuj.weebly.com/uploads/1/3/4/7/134762848/fegiralo_saril_wuledizis_ronagolitajoteg.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/tOAifih/bubba_forrest_gump_camarones_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/guvelebul/Khdgfhi/pewedobu.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/519675023272mbjx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413705/normal_6024a511660da.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/jji5hjq/strange_super_heroes_vs_villains_costumes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480148/normal_601bb847daf49.pdfIn PDF document text
    • http://testertumentum.space/77302797981t9d6f.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/1jfiiUu/1613304024.pdfIn PDF document text
    • https://gitapizi.weebly.com/uploads/1/3/2/6/132683136/zafesoxevevab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fukefuxatolu.epizy.com/how_much_oil_does_a_briggs_and_stratton_675_series_take.pdfIn PDF document text
    • http://lilivuxaja.rf.gd/cds_2_ota_syllabus_2019.pdfIn PDF document text
    • http://pirafabitibabik.rf.gd/autocad_printer_mac.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_off0000f7df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 5224 bytes
SHA-256: c197e5539a5933334aed37cd97e95ad70152fa3a0b63fdd948d3ce028fce3ec2
font_01_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 11048 bytes
SHA-256: a82d54d3fcf7bbc51b2fb36e46456485d16eadcc6abf4b08dd47ba9039375e40