Malicious PDF — malware analysis report

Static analysis result for SHA-256 8736c135152c12c6…

MALICIOUS

PDF

78.8 KB Created: 2020-12-16 12:25:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 80ad47b857eb79e1f6f6c8e063676772 SHA-1: 6e8f765d7b8c6fc9ccc3329afd9db31bba1a72ec SHA-256: 8736c135152c12c6117d214e06e1187a64b4d6d898fd8a1824d5906802abcd4e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://traffking.ru/123?utm_term=central+route+to+persuasion In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445325/normal_5fbc815a6a244.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/4425669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/34cc4d81-f911-4ee5-81d0-fdda3db6abcf/jimenotixiripokuriwaletil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fff96307-5a00-41bb-93d3-693b9bb5ca4e/gurps_4th_edition_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802648e4-c559-4f63-805d-8fc773c2edf5/papilejazazadebired.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56eb321a-850e-45c3-833d-a91591fe2d32/mole_calculations_practice_worksheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd21f7afe2dd55ed9cc0dd/1606230519990/83035813918.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf333c9d-dd23-4635-9f04-496e8405e4d1/soundlogic_xt_bluetooth_speaker_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a835f95-79e7-40cf-b3a9-7d820b181b8e/tibosineg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5996ea6d-42eb-41f8-a65b-70658d302463/hey_ma_mp3_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 4720 bytes
SHA-256: 4432fbc081b4493e6cd3eef76acc55d6bd4579e6fb54a4114bda1cc790c647e1
font_01_sfnt_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 10472 bytes
SHA-256: f96ffdb7ad8027c648bc7a4544fe89ececf1cbe8ff38aed47c54ac94a4c38bb8
font_02_sfnt_off00012061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12061 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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