Malicious PDF — malware analysis report

Static analysis result for SHA-256 61856cf0e465cd93…

MALICIOUS

PDF

90.0 KB Created: 2021-01-06 10:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3dd894aaa922f2e173042eb87effd59d SHA-1: 8fd999b3b45596a4b7538210fa79050b5ad579e6 SHA-256: 61856cf0e465cd93cd3a81ee0faa43e6c8ccde1ee71560c4d880f46053f31c56
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector and a link farm. The document body, though heavily obfuscated, contains text related to 'airplane tickets to colorado springs', suggesting a phishing or scam lure. The presence of multiple external PDF links indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffine.ru/wb?keyword=airplane%20tickets%20to%20colorado%20springs In PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/sowilin_bawafu_letizepivijasa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470017/normal_5fe21221653a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_5fa286bb1a73a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_5f9da857048d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493890/normal_5fe7cdea40caf.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/690e26fe-8e92-40fb-a66d-a718e1711b8e/18010821911.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2af2b052-70f8-49c9-8400-520c49f7caa4/ancient_roman_stola_and_palla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad71713e-7704-4be6-ac30-88555198ac94/fire_safety_merit_badge_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/financial_ratio_spreadsheet_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2feabdaa-9d7a-4341-b14c-2bd6bc84245d/57233363895.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/70389836458.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/backpacking_pack_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf51e8a3-b6ab-4c55-90c6-6dca0c84857b/41375218302.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_off0001171d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171D 2968 bytes
SHA-256: a3409f23d318cb64f50816b13ffa5e4cae8c31e9b9ecf1c6aab81bc325688a60
font_01_sfnt_off000121c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C2 5292 bytes
SHA-256: 7bf9bb81e6359b60c96071fc1e0cc861c48d3fbaf87c2ada5f065f20a8bbe346
font_02_sfnt_off000133ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CE 11400 bytes
SHA-256: dee871ad1ed9aab100a29cd1b4cb6766910a58688ecba8918e7e4628d09b8ddf

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