Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7bbfc51de524aa3…

MALICIOUS

PDF

75.9 KB Created: 2021-02-26 13:25:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6dbbfe8d23a928c2d89295c8c1b04717 SHA-1: 15c21dc1cb740e840e59c3f270289a372f186d68 SHA-256: a7bbfc51de524aa3a0ed9e746a0366f69bbc254a60296bf926df69c3e61e38f0
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL, 'https://fokemale.ru/award?keyword=how+to+become+a+corpsman+in+the+marines', suggests a phishing or social engineering lure. Although no scripts were explicitly extracted, the PDF structure and the nature of the URL point towards a phishing attack, likely delivered as a spearphishing attachment.

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://fokemale.ru/award?keyword=how+to+become+a+corpsman+in+the+marines PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4394079/normal_5fce71673c7f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416136/normal_603559de6271a.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/lefapozizusajesopixen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5fcbd15342c3a.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/afjhdjg/keripajun.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413564/normal_5fce4b122b2f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_5fd3bd3f39a21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_6025158155b24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371505/normal_601a0590e4aa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_602fe18fb2bba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5fc67a38e1284.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://liroporuki.myartsonline.com/janot.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_off0000df7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7D 5120 bytes
SHA-256: b3ea340856a0f26fc9a77fd3a2e93ac7ff4f276d7f830c16ec0f3d5c2a674a01
font_01_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 10532 bytes
SHA-256: cf8bb8cb893110994bbce55aba6d269e24e0f70426fdc58cbe5a8d4653bfe76e
font_02_sfnt_off0001148e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148E 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34