Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4952197a4c6f8a8…

MALICIOUS

PDF

74.6 KB Created: 2021-02-25 17:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 60d9eb70243e611f5ff67b7daddc06f9 SHA-1: 2f886f9d2820c20c09d972af25fa2a89975a85bd SHA-256: b4952197a4c6f8a80d3214bc072098a2722182abd6cd38192d3b050ed5fd3fef
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

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://baarspo.ru/strik?utm_term=modern+industrial+organization PDF link annotation
    • https://gubagomokugexat.weebly.com/uploads/1/3/3/9/133988684/6de38ccc7b1.pdfIn PDF document text
    • https://zanirifut.weebly.com/uploads/1/3/1/4/131407922/5247648.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/how_to_use_scroll_lock_without_key.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/62826767448.pdfIn PDF document text
    • https://kajugomurabamuj.weebly.com/uploads/1/3/0/8/130814292/0d111d10.pdfIn PDF document text
    • http://lebizifijafaxim.medianewsonline.com/mecanica_vectorial_para_ingenieros_estatica_10_edicion_beer_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/2pabvo0/67318138347.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/egjeWmk/chief_followers_mod.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/xeroguru/endnote_x3_free_full_version.pdfIn PDF document text
    • http://duvodix.myartsonline.com/gokip.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/74947944887.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_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 5048 bytes
SHA-256: a02af9469c35338cc277998ee7d6341783612fd33b3d7f99740f45340a68a75b
font_01_sfnt_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 10704 bytes
SHA-256: 87d1cae910eb6dd81b801c0c170e5d4b947ff68865ccf8ad79ce7b0c85cc14e7

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