Malicious PDF — malware analysis report

Static analysis result for SHA-256 86525b52eea69afd…

MALICIOUS

PDF

79.7 KB Created: 2021-01-09 03:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 210dcaa033f78f9cfbd70b15524c2e85 SHA-1: eb6eacd5f9fbadb5ee1f8eabfba48a1fe1de8dd4 SHA-256: 86525b52eea69afd018897d82d66304b925b12ecd8b8c5474a52b5e932d97553
104 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an embedded URL pointing to a suspicious domain, combined with a heuristic indicating a download button lure, suggests the document is designed to trick users into downloading a malicious payload. The document body is heavily obfuscated, preventing a clear understanding of its specific content beyond the embedded URL.

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
  • 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
  • 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://trafficel.ru/123?utm_term=bbm+delta+mod+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4449973/normal_5ff8fda897c8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423453/normal_5fe4b305a3150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_5f90907b96870.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/iCiglhd/38033408739.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449183/normal_5fa2e90ec03d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369143/normal_5fd6d2623d6e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/mokamoba/assassin_s_creed_syndicate_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e175e5-d31b-483b-9cdd-78bf16ef9aef/89070215086.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/2224984936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e3df78-2f46-4310-a458-eb69d7ffc60c/51554184559.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/purulixatuzefanilalamuku.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/47687902129.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 5084 bytes
SHA-256: 182fd8855c0ee83d34306a50b9b391df93c11e337c1abb8fc7c7cdfff8aeb015
font_01_sfnt_off0000e07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07E 5672 bytes
SHA-256: 900cd01f2f8cbadfcc85ae0ce9b7a644a67e6011d4c3a95b4e90e206186ab29f
font_02_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 10716 bytes
SHA-256: 25a326d0c2fce3221a69908d7c4880393347f7279d471d9f2278b716fa6b5845
font_03_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 19076 bytes
SHA-256: effe18b01e9122a8d0576627875542739213f3da1679dc4de6829801bbb9d8b8

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