Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c3355bb0e413a2…

MALICIOUS

PDF

70.5 KB Created: 2020-12-22 18:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46d2902db6dcef122c8b74b5eafdc8cc SHA-1: 585ce320418d705e5b762b01c9f580fbbfb5abce SHA-256: e4c3355bb0e413a21fe12941ed9ba4cdb4b22646783adcb36866d0b20f31ce1b
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically to the URL https://traffmen.ru/123?utm_term=duluth+wolfpack+lacrosse+roster. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is https://static1.squarespace.com/static/5fc5c6ec2bbd74065827f47b/t/5fcdf717fe657040d5b64aed/1607333655835/police_sound_and_ringtones.pdf. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or trojan-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=duluth+wolfpack+lacrosse+roster
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/vasap.pdf
    • https://piziruzebizopu.weebly.com/uploads/1/3/4/3/134350425/603c98249.pdf
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/077ec86c1fef3b1.pdf
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/fumunumivufudizit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5c6ec2bbd74065827f47b/t/5fcdf717fe657040d5b64aed/1607333655835/police_sound_and_ringtones.pdf
    • https://uploads.strikinglycdn.com/files/e9ecdc64-debc-4fe8-aff0-1076dce9647b/jifofe.pdf
    • https://static1.squarespace.com/static/5fc1116c11f6a41984869c2f/t/5fcc0cbd24c49707d30c76ef/1607208126275/tamozudunosije.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5bff1972c46e3c962b4e/1606376447996/vakejutebezokaxur.pdf
    • https://static1.squarespace.com/static/5fc57497bd14ff0dd2bb5313/t/5fc874e3ec83506b047b2362/1606972643941/45987742574.pdf
    • https://static1.squarespace.com/static/5fdd5508eb685147a09c9c9e/t/5fddc9a82baf317dc383cf9a/1608370602230/58703758378.pdf
    • https://uploads.strikinglycdn.com/files/d0bf1f9f-9ad5-4f34-81fe-09ef304e93e0/7353157313.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf18e4f98375720a59b44/1606283664763/60854183619.pdf
    • https://static1.squarespace.com/static/5fc2aa5268612547ed696d4d/t/5fc54f507acac6192a7165e8/1606766420179/5721783325.pdf
    • https://s3.amazonaws.com/ditiruz/locator_implant_attachment_quick_reference_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c03c.bin
d49cd2f84126b0571191ca2dae2325f465e1c20bf360f5fb0ca9e39725dc9666		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC03C 5260 bytes
font_01_sfnt_off0000d230.bin
1a3f4744fc35d386919e104f98d3c7f6892b09c7aad1447b2e72914a35d156d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 10984 bytes
font_02_sfnt_off0000f77f.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 16204 bytes

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