Malicious PDF — malware analysis report

Static analysis result for SHA-256 28509ae4a84cf758…

MALICIOUS

PDF

63.6 KB Created: 2020-12-15 03:09:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f45bc432b06d4b2f95b8c6ae87e957e3 SHA-1: babb07581da093f05b6f464f37d3eaa8cf0e9f7d SHA-256: 28509ae4a84cf7580df1c4e50565685b880d16201c370f6fb546d998a89c6623
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, which is highly indicative of a phishing attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the presence of the external URI suggests an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/123?utm_term=richland+county+sheriff+department+salary PDF link annotation
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/2818241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418401/normal_5fcf04a632a53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502493/normal_5fc0c3a1e1cd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f9d8e8451cba.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/leguvefu/static_gk_for_rrb_po_mains_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/xijepobik.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/autocad_2007_setup._log_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c2040b-89a0-47db-80d3-9df3ac5e82c1/tyrones_game_shack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8e2c035-909d-4403-bf05-db6f697b433a/sumoredaleratodaf.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/asge_guidelines_antibiotics_endoscopy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2727366-8b86-47b4-b644-59941827dd82/tokyo_afterschool_summoners_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7af4058762305c0fa1f2b/t/5fd61786034a586a4f3ab6b9/1607866246948/airtel_xstream_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/jekubaginumod.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_off0000bb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB13 5504 bytes
SHA-256: 3190d48e00e52e4b36865aa8dd22799800003cab25bc9193b61e243a37ccbc68
font_01_sfnt_off0000cdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB0 10412 bytes
SHA-256: 68f0ff5caa8d95751cfb36ebe884739358162a1b1c096e888771ec6c94634bd6