Malicious PDF — malware analysis report

Static analysis result for SHA-256 271e56cc2bf7f5df…

MALICIOUS

PDF

90.2 KB Created: 2021-01-10 22:59:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 679fe1554fdf84ea4dd278e672eb05ad SHA-1: 7a6efb6dd3acf1888e666131696e3b1d9eb943cc SHA-256: 271e56cc2bf7f5dfee2a2e4aa2097b90c8f76f77b6aedca52aceb45d9a015205
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a known malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'toastmaster icebreaker speeches', suggesting a lure to disguise the malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=toastmaster+icebreaker+speeches In PDF document text
    • https://site-1178527.mozfiles.com/files/1178527/world_clicker_idle_clicker_guide.pdfIn PDF document text
    • https://site-1166625.mozfiles.com/files/1166625/download_cc_cc_apk.pdfIn PDF document text
    • https://site-1241413.mozfiles.com/files/1241413/tamanna_movie_songs_telugu.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/rutajotu.pdfIn PDF document text
    • https://bibunifa.weebly.com/uploads/1/3/4/0/134040356/bb5ca9b3647e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448743/normal_5fb303fadd9f2.pdfIn PDF document text
    • https://site-1176860.mozfiles.com/files/1176860/57418711764.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/jghejbS/new_cartoon_movies_coming_out_2021.pdfIn PDF document text
    • https://site-1168346.mozfiles.com/files/1168346/castle_wars_2_kongregate.pdfIn PDF document text
    • https://site-1178139.mozfiles.com/files/1178139/meteor_shower_animal_crossing.pdfIn PDF document text
    • https://kenemujawov.weebly.com/uploads/1/3/4/6/134645985/2061542.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/79bbb00a730e70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453118/normal_5fc95fe73584b.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/rexogeguxosix/52842143648.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_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 5292 bytes
SHA-256: 73aac14abbdbcf0a8caf7ae24a5508cf4635a43fc4e0faac23fce78498949f12
font_01_sfnt_off00011381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 3340 bytes
SHA-256: 8171ad5b6341698e8b405477a20f9b431ae9c7843dd3f9e271c207045a6b0a1f
font_02_sfnt_off000120d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D9 10948 bytes
SHA-256: a1a9d5b10b69a6eb55531b13ff2f609eddbadeb17272d1cab540855c2fabe690
font_03_sfnt_off0001467e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467E 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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