Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b16ec57b60b9f8…

MALICIOUS

PDF

80.3 KB Created: 2021-01-06 20:04:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e2f1983abc9e2afe62f8f6c3831694c5 SHA-1: 7ef774a0fa9b9d9b9f5fb3e1204fbe4ccf313dce SHA-256: f9b16ec57b60b9f865f0952f28709247e28eef528a60156d71298cca3f4e6ad1
136 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_MFA_LURE' heuristic indicates the document is designed to trick users into providing credentials or MFA approval, consistent with phishing. An external URI pointing to 'traffset.ru' was extracted, likely serving as the landing page for this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://traffset.ru/aws?utm_term=up+lekhpal+bharti+2019+online+form
    • https://cdn-cms.f-static.net/uploads/4454556/normal_5fa0c353f01ca.pdf
    • https://cdn.sqhk.co/tuteremekome/hggMgje/nubiduko.pdf
    • https://cdn-cms.f-static.net/uploads/4368496/normal_5f905ab98573c.pdf
    • https://cdn.sqhk.co/xetajikok/vjifjae/my_bowling_3d_download.pdf
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f8f1378d37a8.pdf
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5f8f52d620953.pdf
    • https://cdn-cms.f-static.net/uploads/4371514/normal_5fa85b8a1f96a.pdf
    • https://cdn-cms.f-static.net/uploads/4415534/normal_5fabace19a21b.pdf
    • https://cdn-cms.f-static.net/uploads/4445888/normal_5fb95aee138da.pdf
    • https://static.s123-cdn-static.com/uploads/4475999/normal_5fe3371066de7.pdf
    • https://cdn-cms.f-static.net/uploads/4427104/normal_5faab58393cde.pdf
    • https://static.s123-cdn-static.com/uploads/4386622/normal_5fc6942dd5fce.pdf
    • https://cdn-cms.f-static.net/uploads/4374181/normal_5f8c0e632504f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/68a9dcfa-8771-4ac4-ba9c-5414c2d9075f/34929976165.pdf
    • https://uploads.strikinglycdn.com/files/95e1b0f3-1256-4f09-9a3c-815f79773104/59367442875.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df7a.bin
86c931fc5c3e4aef706cf704923736a9ffaa3d537cfda69856ae571cb3158249
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7A 5640 bytes
font_01_sfnt_off0000f27d.bin
e122eaea97b571af461f77c10f7dd0e0cfecb4b70b3ae890e277e807d53a437a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 10168 bytes
font_02_sfnt_off0001154f.bin
36f661d17906d4d0c61355010b2259acf24e4c596b395cfa7eac516706a74326
pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 9616 bytes