Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2188d62de30e8d…

MALICIOUS

PDF

77.4 KB Created: 2021-02-15 02:47:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 34308a12b915c1db6fefe689de4d8eea SHA-1: db041da848b159f8a9b3bb9fb1da00abe6abdc8e SHA-256: ce2188d62de30e8d6ca82a6e8c967f06aa31f34d7ad3a70da2937901c6b31b77
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/123?utm_term=flip+table+meme+gif PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382429/normal_5ff5e8233d7d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417525/normal_5ff7c39ad606f.pdfIn PDF document text
    • http://goromeo.club/hd_aquarium_screensaver_freevcpka.pdfIn PDF document text
    • http://216tilford.com/qdialog_close_button_signalp1t6e.pdfIn PDF document text
    • http://turiwovezaz.iblogger.org/inquisitor_martyr_game_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418175/normal_6016739a498d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480585/normal_5ff357455e209.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/BCYggjM/dino_run_game_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404523/normal_60291f79e4484.pdfIn PDF document text
    • https://cdn.sqhk.co/danexili/ibgjgj1/dining_table_set_for_6_walmart.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nagurinetawami.rf.gd/video_songs_of_saaho.pdfIn PDF document text
    • http://suzujikuluvujov.rf.gd/ultimate_mortal_kombat_3_shang_tsung_transformations.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/android_calendar_app_not_google.pdfIn PDF document text
    • http://nimunofat.epizy.com/jijazolofejoxekitar.pdfIn PDF document text
    • http://jozazesebogole.rf.gd/report_types_in_business_communication.pdfIn PDF document text
    • http://funazowo.rf.gd/jabisosi.pdfIn PDF document text
    • http://dinotowiteve.rf.gd/joxozepobevebafawum.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/risor.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e559.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE559 1788 bytes
SHA-256: 3c800ba1d582d009a6b6a49bcf6e46136f8736332ca6d591b7d817d5dd9ceba4
font_00_sfnt_off0000c88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88D 3256 bytes
SHA-256: 2ca3b6512f93438a4ada546375e418990fcce11103ad00b29c46cd7f38a8a624
font_01_sfnt_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 5040 bytes
SHA-256: f15460fd40917a37a64412d3ffdc25c36e69ccab1850dc0aad843f8d8eac4dbc
font_03_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 10464 bytes
SHA-256: f0c8fd0ce2a5a81a9ed700071e1e934e7bb9d4e3ed79de554564b7cbff2e1fe5
font_04_sfnt_off000112a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 16108 bytes
SHA-256: 38178855f7d6cdbd9a9b3377127f2cbc1d06cbb3f29d3b00b1fe4808a2a2bd39

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