Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2121045404c593…

MALICIOUS

PDF

74.2 KB Created: 2021-03-03 12:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ebbe67d2088e2c5ee4a7a13b9ebbebe2 SHA-1: 5557ec60f68376f077994388e41ac304762d2f80 SHA-256: ef2121045404c593a62aaee2aac477fa234aba23a116d0be2f8f8a288bd4defc
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 0.9999

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/123?utm_term=how+to+trade+for+a+specific+pokemon+in+sword+and+shield PDF link annotation
    • https://lovivusopeme.weebly.com/uploads/1/3/6/0/136095788/8243638.pdfIn PDF document text
    • http://vetebozo.mypressonline.com/99463024218.pdfIn PDF document text
    • https://voxesisa.weebly.com/uploads/1/3/4/3/134349259/a1fd5b61b9e.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/would_you_rather_questions_to_ask_a_guy_dirty.pdfIn PDF document text
    • http://kerorakesona.22web.org/the_little_match_girl_disney_music.pdfIn PDF document text
    • https://xatevixi.weebly.com/uploads/1/3/4/6/134651360/8c7a898b.pdfIn PDF document text
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/mudur_saralenolagesos_pozevavizusa_vukoxasuxes.pdfIn PDF document text
    • https://sixalusizefew.weebly.com/uploads/1/3/1/3/131378898/jogokumoxol.pdfIn PDF document text
    • https://diwijavel.weebly.com/uploads/1/3/4/6/134691177/5764356.pdfIn PDF document text
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/8583183.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tuxexi/tiwiko.pdfIn PDF document text
    • http://nulazuwob.rf.gd/angular_component_templateurl_dynamic.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/cyberpunk_red_review.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/56699970417.pdfIn PDF document text
    • http://toxasetakibo.rf.gd/nafera.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_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 5512 bytes
SHA-256: 349835d3354d00f75ca6795343fcf9acb6b3597ad52be88ae2703f0ce95d5a43
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 10380 bytes
SHA-256: beefe4879bf3492b59ca8d8a5593e842ac911de7e8764fb1eceaad5afa03fbe5