Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78b0d624181fd77…

MALICIOUS

PDF

73.2 KB Created: 2020-12-30 18:47:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9f99271afabff82a691c849e3c7f2261 SHA-1: 73533a252b68e2ee872e4f10e99ecac32986cf26 SHA-256: a78b0d624181fd7717809e98e35e117214e2dd2bf61ab3667e84c3e4b670237f
116 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malformed exploit stream and an embedded URI pointing to a suspicious domain. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to search queries, suggesting a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/strik?utm_term=what+is+dingleberry PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464869/normal_5fd33c5322e6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449774/normal_5fc72cd1656c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_5fa6f51573283.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402517/normal_5f96c8cd776db.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/sugowubuf/bcom_books.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/digital_amazing_bible_timeline.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/jefijibilixekiz.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/jowevukeramabe.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/aileron_heavy_font.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/junior_android_developer_resume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec04fb3e-7128-4fa8-bacd-233aae2592f1/cynon_valley_pool_league.pdfIn PDF document text
    • https://s3.amazonaws.com/faxaxos/fibemozunekif.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/2011_bmw_s1000rr_performance_specs.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_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 5340 bytes
SHA-256: 48186d9df1bfd6481be1436c89135033d8a6c346e24ee93264488051b11e4275
font_01_sfnt_off0000f01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 11820 bytes
SHA-256: f46efc59e849ec39d6e519c6c8a238a8bbcb2b41081af73d1baec8b44163a3f8

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