Malicious PDF — malware analysis report

Static analysis result for SHA-256 1485435fe93484f7…

MALICIOUS

PDF

72.1 KB Created: 2021-02-17 14:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5d44d76b6595120d740b76946c483c1b SHA-1: bb6a7952847bc733790bbb1e9ad3050608f78b9c SHA-256: 1485435fe93484f710e1d4b55d1c12a933e1fd65fb43ced5828cf28628370b11
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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=calendar+girl+series+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464852/normal_60038e575877b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409113/normal_5fe44f98211bd.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/pofodopoxukilosirlc99.pdfIn PDF document text
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/29cc29598fa24b.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/84435201311zp6bq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489839/normal_5ff4c8d179d6e.pdfIn PDF document text
    • http://razvivatel.blog/bandeya_song_mr_jattx36ts.pdfIn PDF document text
    • http://bupro.asia/general_electric_dishwasher_filterms42q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_601b61fecfebd.pdfIn PDF document text
    • https://fipufiradak.weebly.com/uploads/1/3/0/8/130813779/8b52b63f3f30f.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/ghieheb/rebitepimixe.pdfIn PDF document text
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/e8524ab815232.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA8 5112 bytes
SHA-256: 04dac82b354423eb7b4396ef34ad043c61aa0e652e9c5f96cb8bc07f46b1bfcf
font_01_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 10672 bytes
SHA-256: 16695a1e7b34d64516e2766a50ab761be554aebe0e9c7830dcc74e3d74800351

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