Malicious PDF — malware analysis report

Static analysis result for SHA-256 c47b5519ff0d5020…

MALICIOUS

PDF

74.1 KB Created: 2021-02-15 14:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5c8bb77718cfb0fc304ad4a9f6138b56 SHA-1: a58ace92ae6c917eaa0a70bb8c99479d098a7b5c SHA-256: c47b5519ff0d5020ef5fd7fb7dd4d5f55af7c6c288ecbce69a0d3a5b96899fc5
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable hosting. The ML_NYX_PDF_MALICIOUS score of 0.999842 strongly suggests malicious content within the PDF.

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://druttle.ru/wix?keyword=timber+trail+elementary+preschool PDF link annotation
    • https://cdn.sqhk.co/kososojog/PHvgdqP/billie_eilish_full_name_pronunciation.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/gjhlgiZ/ice_cream_cone_calories_no_ice_cream.pdfIn PDF document text
    • http://bilapak.66ghz.com/jevarozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_6013130869e30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_602991a27100d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471988/normal_5fcea13492de0.pdfIn PDF document text
    • http://dewobazul.22web.org/30679665759.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/8f58aa4ce755.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejesigivilowen.rf.gd/baby_shush_sound.pdfIn PDF document text
    • http://xolemobubusosi.rf.gd/lizapisibusarizofalaboful.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/xutiputirasef.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/android_okhttp_post_example.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/bhojpuri_gana_song_kare.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_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 5364 bytes
SHA-256: 6bc99191199234053d3f5328c49af12ef1becd0b2deaf001bc15ace628a5e214
font_01_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 10136 bytes
SHA-256: 76000fc46925476225129ebaa4e7047bed429e596fdfc5b7e74680ee1110ef39

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