Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e825b487b49d172…

MALICIOUS

PDF

73.5 KB Created: 2021-03-19 07:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 83a9669e26e1ce38eb7449b8873941d2 SHA-1: 32ebe1f454633508eb4dae9f6e4282b42e987095 SHA-256: 3e825b487b49d172c8b9a2911db79b0362d3620f352ec527fabdb61666803f4b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and potentially malicious hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were extracted, the structure and embedded links point towards a common tactic of directing users to external malicious sites.

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://mezovuduw.ru/wix?keyword=945+area+code+time+zone PDF link annotation
    • http://mogimetekojubar.scienceontheweb.net/70054628567.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/what_is_the_iso_31000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_6037774565313.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/gizijiwubobako.pdfIn PDF document text
    • http://ductsunlimitedins.com/254835860355h2dw.pdfIn PDF document text
    • http://info-pages.ru/accepting_a_resignation_template5z3ht.pdfIn PDF document text
    • http://priz24.site/86567701097t109w.pdfIn PDF document text
    • http://mgacessoria.online/reverse_chronological_resume_template97j3i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5fd67cf2a69b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/04039608-5c2b-4a90-a22e-0e0d0ce8670e/37730184576.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_6cb276db5787478a8e2f4a19a81c0086.pdf?index=trueIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_2946a6fc08f0492c95a67f8ff35b6d5b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cce14b9-de75-44c3-80c6-0b4b1ec050f8/how_to_get_google_maps_to_open_at_my_location.pdfIn PDF document text
    • http://xetorofowuwid.epizy.com/real_estate_agent_certificate_melbourne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd6d2178-a3c4-40fa-8a54-c38424c3658f/self_reliance_essay_by_ralph_waldo_emerson.pdfIn PDF document text
    • http://jefefudutumoki.epizy.com/71526795524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73bae9c8-bce1-4a86-b7e6-ccc7a63b7969/what_causes_dry_itchy_patches_on_scalp.pdfIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_74e63b857cf64174b4fc9d2b53ab3b05.pdf?index=trueIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_26ae81a4f01c446dbf223c98eed41b5e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e6b9e9-2bd7-41e9-81f5-b1c1a07014c3/47211102848.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_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 5200 bytes
SHA-256: e9d183fd9ae35808e7a7c07e0f2810cf7c34faa46d90e045ebc0f599f0ac1554
font_01_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 10556 bytes
SHA-256: 4e9a0b8e7654f999f96f6af1978cdae90ac659822a830f9133cab745b4d7d38b

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