Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb8e9bea919d6f3…

MALICIOUS

PDF

78.0 KB Created: 2021-02-22 20:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8315fd47fdfcbcf454dfe3ca73adbb98 SHA-1: 4623e165f5b0073a7d089cef96d936db97f9cb9a SHA-256: 2cb8e9bea919d6f3a46828590a9ac331a117679df9601c76e87a6a5e83d6996a
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to a study guide, aiming to trick users into visiting these malicious sites.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/wix?keyword=heart+of+darkness+part+1+study+guide+questions+and+answers PDF link annotation
    • http://swiss-family.space/497456149785uno4.pdfIn PDF document text
    • http://phtech.site/45600774946w9rv1.pdfIn PDF document text
    • http://urott-hu.com/gabaj0nddm.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/iaheWjb/51383036553.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/ge6iiii/gerugeded.pdfIn PDF document text
    • http://topvideo.design/delta_band_saw_28-180_reviewdroer.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/O5jfegd/87892258989.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/ijSgfLY/29367738287.pdfIn PDF document text
    • http://dimax-matrasy.ru/jawuvetezorujqe635.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/ShR8jif/62398707152.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/lulomibusonurexadux7slbg.pdfIn PDF document text
    • https://cdn.sqhk.co/vofonowul/dihwkhe/71209648393.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
    • https://s3.amazonaws.com/kesumasaka/histogram_gcse_questions_edexcel_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/brother_feeling_tamil_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/suxuzubojut/davinobipusaborojag.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/51145498462.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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 5456 bytes
SHA-256: 4857427d4b676d9c56eff05b6217964a77d6514194d9cde704b5b7739fb5bd12
font_01_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 10116 bytes
SHA-256: 4bb26e2853d929e8cf9f1129b428277d89491d1ae1fc01223149d5051114183a
font_02_sfnt_off00011c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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