Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2f39c759615471…

MALICIOUS

PDF

80.8 KB Created: 2021-04-11 09:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: de8ec17de606d77afa21166f8e58dbc0 SHA-1: 9521aa014655343fbaea245c510cc224960a4e55 SHA-256: fa2f39c759615471854c77bf4b93a189311d08f5cce7000d6b0ee733100e7be9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as book titles, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to various PDF files, likely intended to trick users into downloading them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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://jacksth.ru/strik?utm_term=how+to+read+the+bible+for+all+its+worth+4th+edition+pdf+download PDF link annotation
    • https://cdn.sqhk.co/xudapurofoz/I0tigzO/download_steampunk_tower_2_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/lonuxonemor/hicATxk/69393074265.pdfIn PDF document text
    • https://cdn.sqhk.co/momugutatok/bijJlgh/que_significa_preludio_en_musica.pdfIn PDF document text
    • https://xaperosojemi.weebly.com/uploads/1/3/0/9/130969510/839fbb4072d4.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/jeifidZ/country_music_videos_free.pdfIn PDF document text
    • https://fumevido.weebly.com/uploads/1/3/0/8/130874276/10b4c.pdfIn PDF document text
    • https://gumomerad.weebly.com/uploads/1/3/1/8/131856086/vonubufimar.pdfIn PDF document text
    • https://xumodaniteged.weebly.com/uploads/1/3/4/4/134480563/fa83db04.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/takebemanijewok/lewolinu.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/xisowerometerepowolul.pdfIn PDF document text
    • http://pevutedijubixit.epizy.com/que_es_genetica_vegetal.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/poduwegudinerobimigu.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/197890804.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/58026911644.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/what_are_the_five_main_components_of_a_computer_system.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/zoom_h2_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/pisubijamutebuwar.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/type_2_diabetes_treatment_guidelines_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/fipabexixuge.pdfIn PDF document text
    • http://jogatitow.epizy.com/file_tidak_bisa_dibuka_di_hp_android.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/matekaturoxol.pdfIn PDF document text
    • http://levuvov.epizy.com/birthday_invitation_card_design_format.pdfIn PDF document text
    • http://zarufezaseva.rf.gd/jorge_luis_borges_el_aleph_cuento.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_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 5408 bytes
SHA-256: 8d29aa5f07ff1f304792a2c2ef6faf836ea05c6d90bfebba3c0b584216a034e2
font_01_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 11048 bytes
SHA-256: ba7697a8bab843e2344ee5b629f3ad8a59f6cb83fea10eac5308b8b855450828

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