Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac8ebaa1b78eba6…

MALICIOUS

PDF

65.5 KB Created: 2020-11-22 21:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6dc72431b2cc42437f77915491c5febb SHA-1: 72e53380b1c98117308881ac5e9361109307c827 SHA-256: eac8ebaa1b78eba6354eb5191aa2984226b0d58929561ee62dc1c5432cf65c58
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'traffmen.ru'. It also exhibits characteristics of a link farm, with numerous external PDF links, one of which is also flagged as malicious. The ML classifier strongly indicates maliciousness, and ClamAV detection confirms this. The document body, though heavily obfuscated, appears to contain keywords related to educational content, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=algebra+6th+grade+khan+academy In PDF document text
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/nivikar.pdfIn PDF document text
    • https://duvujisukodat.weebly.com/uploads/1/3/4/6/134674851/df91c48f5ab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0830eb54-d3e6-4d61-beb4-a42ae0198f57/error_2_luces_rojas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/036bf302-84c1-409a-a2be-abdd36e12e71/carta_informal_ejemplo_corto.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/family_and_friends_4_workbook_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff783524-5c46-4ac5-a510-608ac322a6f0/zezesopimojoxawujidi.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/kuwenexetofanomuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccfd6d23-f443-43b5-83e9-f0ba4f757aae/tokudovuwetozuxipuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/018f7fab-bb32-426d-9be9-917e894d8ecd/kibikoragesatupesan.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/tigapokunapajikovik.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/48464833986.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_off0000c4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E9 5624 bytes
SHA-256: 14ea8f96521d0544b1165d5c986d335bf4ce51bdb8c2c85c447501ad0130f4a2
font_01_sfnt_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 9904 bytes
SHA-256: e9aea49afaafee2f57f671bcd69232bbfb2e0b7f32ebbc8a4866c258a4455fcf

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