Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee5e1866cefa9bb…

MALICIOUS

PDF

77.8 KB Created: 2021-02-20 14:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: cd1288896d55cd14db91f44424cea24a SHA-1: 984d586ac1129d925dae65bf1f61c0e0eb7c9e3f SHA-256: 4ee5e1866cefa9bbe68cb28314b7a17e114d2b5a252556cebb176342b9ad3ec2
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs pointing to other PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external links suggests an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=casio+g-shock+master+of+g+gravitymaster+men%2527s+watch+ga-1100-1a1er PDF link annotation
    • https://cdn.sqhk.co/gajerivab/GY1jbhe/classklap_learning_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tatomaxeriri/9KgiaXV/noblemen_1896_apk_mod_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/zgijbMw/doom_cultist_base_slayer_key.pdfIn PDF document text
    • http://savetewolixoful.iblogger.org/ranaritevupe.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/aCdggHn/four_planets_in_retrograde_meaning.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/nuxuremexaram.pdfIn PDF document text
    • https://walamezer.weebly.com/uploads/1/3/0/7/130740591/xejafaruzidamew.pdfIn PDF document text
    • https://bakefakibozig.weebly.com/uploads/1/3/4/6/134678469/00ab6d1c.pdfIn PDF document text
    • https://cdn.sqhk.co/biluvetizom/iibjaOK/23877538369.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/gcshcX8/48139227903.pdfIn PDF document text
    • https://cdn.sqhk.co/ralofobo/d2xgfCj/karosopivagafanovim.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/3651459.pdfIn PDF document text
    • https://cdn.sqhk.co/zarejesorufo/ibahcii/tap_titans_2_build.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zowuxepalaget.epizy.com/38233743217.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/centurion_d5_evo_programming_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/bts_answer_love_myself_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/57615751226.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/bharat_ane_nenu_cinema_songs_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/uk_immunisation_guidelines_green_book.pdfIn PDF document text
    • http://wuvatunaje.rf.gd/vemafolivomozij.pdfIn PDF document text
    • http://vevifibider.epizy.com/deep_impact_full_movie_300mb.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_off0000f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EF 5744 bytes
SHA-256: eff769aa9ddf777c36c5755d306a4f739e48468f831569bbb090aa2640365640
font_01_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 10220 bytes
SHA-256: a9a7035dfbd39fdb1d45db606f58c3f4782b2444818e5117c0cdd80f60b6459d

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