Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a7c5a0f9e69861…

MALICIOUS

PDF

72.5 KB Created: 2021-01-14 05:41:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 5e4859f46c02948d7e944eb3c3b2e760 SHA-1: 23128a2b895d7a6bd3c91361c262c8e948464b6e SHA-256: 31a7c5a0f9e6986162867b86854979a6755c873cd1fd0978b18b9cadb9345195
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The embedded URLs and document body suggest a lure to download potentially harmful software, such as a Chrome APK for Android. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/aws?utm_term=chrome+apk+android+2.+3 PDF link annotation
    • https://site-1173576.mozfiles.com/files/1173576/wifi_hotspot_software_for_windows_xp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411245/normal_5fe5e89e6d952.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/kopfVhc/smart_puzzle_snap_frame.pdfIn PDF document text
    • https://cdn.sqhk.co/jivaduzar/whe3gce/worlds_unbelievable_places.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_5fd32d3c14308.pdfIn PDF document text
    • https://site-1176202.mozfiles.com/files/1176202/daxabupenire.pdfIn PDF document text
    • https://site-1171753.mozfiles.com/files/1171753/78114085982.pdfIn PDF document text
    • https://cdn.sqhk.co/vajegipofuz/ZsiaULt/shaolin_kung_fu_training_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373520/normal_5f8d5628d1db5.pdfIn PDF document text
    • https://site-1175310.mozfiles.com/files/1175310/52532133290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373757/normal_5fccd96058ed8.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
    • 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_off0000d28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28C 5112 bytes
SHA-256: 49887dcd2e662191bd36168cafaa18b5d20130414e9d808511b728758ede015a
font_01_sfnt_off0000e3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CA 10468 bytes
SHA-256: 63bd9fa23d0128cdeed27154ab86a94acaf92e2b2a618ea72315e00cf9b58685
font_02_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333