Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66d931dbcf9134a…

MALICIOUS

PDF

92.2 KB Created: 2021-03-20 20:29:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 54edb204bebbcffd360ae25454612e24 SHA-1: 54a315ca949faa5f0e2d447606aa9150662aa2d6 SHA-256: e66d931dbcf9134af5e50d36f7ea3b3c5846087b17b724e3c3d8636a193bb3d7
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. 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 0.9993

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/wix?keyword=graphing+polynomial+functions+by+hand+worksheet PDF link annotation
    • https://dobizonetalede.weebly.com/uploads/1/3/5/3/135394553/27ab4a.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/qhhXgdH/tutorial_preset_lightroom_peach.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/Y66hfah/22390089803.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/ramadan_calendar_2020_saudi_arabia.pdfIn PDF document text
    • http://tiwilofojifig.sportsontheweb.net/logitech_x-530_5.1_speaker_system.pdfIn PDF document text
    • https://ziduxibuzogegu.weebly.com/uploads/1/3/4/0/134012824/ab299c3.pdfIn PDF document text
    • https://cdn.sqhk.co/kanonilabepi/3vHgiii/scert_ntse_admit_card_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_602ea9270df30.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/jj3f7l4/full_harvest_moon_october_2020_meaning.pdfIn PDF document text
    • https://tufagata.weebly.com/uploads/1/3/4/5/134587591/3869404.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/ijgnjdI/proxima_centauri_star_color.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/djhbWgj/time_data_flow_diagram.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/vawasobedilisasuwijat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5fe7825102c39.pdfIn PDF document text
    • https://lirisuvobuku.weebly.com/uploads/1/3/5/3/135399047/lomezovemawugew-jogewozedixit-dobido.pdfIn PDF document text
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/julesosobo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417222/normal_5fc6c7bdde054.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/iG8Dojb/90290490330.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/jerry_garcia_band_after_midnight_chords.pdfIn PDF document text
    • http://siwemoxoxawevuv.atwebpages.com/birth_chart_in_tamil.pdfIn PDF document text
    • http://sojufuka.atwebpages.com/how_to_heat_up_tamales_in_a_pot.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 3396 bytes
SHA-256: 341954e851ab76e6c675809153f82d55f3f5fed47bc8a5ff702b4bab137d62c6
font_01_sfnt_off0001148d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148D 5996 bytes
SHA-256: c94f60a92d9aeea023e0921707c459526928fc3c0dc05f29eb5a6c04e8af594f
font_02_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 10804 bytes
SHA-256: a2e3ed2551b7de92f953753229662bedf5767c005cb0bc9ae51b0384518279a4
font_03_sfnt_off00014deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DEB 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c