Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aae5b4aca82a32e…

MALICIOUS

PDF

70.6 KB Created: 2021-02-09 17:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a9da5104736e5589e617beb0ad981ed6 SHA-1: 52557f251e262b44324d44d754509947884e7580 SHA-256: 5aae5b4aca82a32eeea76fb5094a9b9fde79602af71c16738d552aca9d672ecf
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The presence of external URIs, including one pointing to 'seumenha.ru' with a 'biogas plant report pdf' keyword, suggests a lure to download further malicious content or phish for information. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wb?keyword=biogas%20plant%20report%20pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414489/normal_5fe6ad8b397f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478703/normal_6008344a81f22.pdfIn PDF document text
    • https://tupobufilu.weebly.com/uploads/1/3/5/3/135310482/9e8542.pdfIn PDF document text
    • https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/9b3388f95c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_600a7a76e19bb.pdfIn PDF document text
    • http://ergors.space/cyberghost_free_installeroh2o4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492278/normal_5fce88a41f00b.pdfIn PDF document text
    • https://walowopus.weebly.com/uploads/1/3/5/2/135295279/8042634cd67c.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/iajaghB/best_retrowave_artists.pdfIn PDF document text
    • https://kolijegidixut.weebly.com/uploads/1/3/1/3/131379325/2a9e50b4b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486051/normal_5fe45a8f1f13b.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/xumakomowi/coaching_session_evaluation_template.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/mathematical_logic_kleene.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/karuriroboberefavovot.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_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 5260 bytes
SHA-256: cce8f2883efa94dd62e43239279a445daa29d020591bcb6e061d11797fab3004
font_01_sfnt_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 10192 bytes
SHA-256: 8696766db550e13cdddf19a4e08241d42016ee16e871ae6361c4ec4895f0ac18

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