Malicious PDF — malware analysis report

Static analysis result for SHA-256 7805cf45b9bfe099…

MALICIOUS

PDF

76.4 KB Created: 2021-03-11 01:33:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df7ea5814f4291b9b85f2735058157c3 SHA-1: d2a0c300ded3346c2a318282dd4d1021ee7cbbe6 SHA-256: 7805cf45b9bfe099d3f14e7e72981d7b62f0dfc2ea904467dc55c858e9e5d213
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or a scam. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to deliver a malicious payload or redirect users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=c%25C3%25B3mo+se+denomina+la+energ%25C3%25ADa+almacenada+en+el+objeto+debido+a+su+posici%25C3%25B3n PDF link annotation
    • https://viwifigejemi.weebly.com/uploads/1/3/0/8/130814408/eb2d63a2d78520.pdfIn PDF document text
    • http://bravos-kids.ru/kejinibo66i4f.pdfIn PDF document text
    • https://zukafetovozod.weebly.com/uploads/1/3/1/6/131636890/8894467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426415/normal_60110192e0fab.pdfIn PDF document text
    • http://fruitnaturs.space/987431009739u7ke.pdfIn PDF document text
    • https://lewuseloti.weebly.com/uploads/1/3/1/4/131437615/03d55377e.pdfIn PDF document text
    • http://molotkov.site/bobiribobkj22b.pdfIn PDF document text
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/c19fe65510a001.pdfIn PDF document text
    • http://slimerecipe.org/45456030064o28zi.pdfIn PDF document text
    • http://8gusevshop.space/zozedazenuvezirls8iv.pdfIn PDF document text
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/232535b3bf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_60222cd34545c.pdfIn PDF document text
    • http://sdfafq.info/tchibo_cafissimo_compact_manual_englishsgvnw.pdfIn PDF document text
    • http://vidclips.design/mapa_de_carreteras_de_mexico_202013rin.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/31068971578ikvnw.pdfIn PDF document text
    • http://presente-top.store/export_ipad_garageband_to_mp3pza55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_7105d3b5daab4980aaea510d83046eb8.pdf?index=trueIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_4060f73ba6df409691ec2bd00d9834c3.pdf?index=trueIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_f06c59119ea34513b4629833fbe487c2.pdf?index=trueIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_df4e7a98e85b4a6fa7e0e55a8139a513.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_af2edde64fb843aabb2f0975d024230f.pdf?index=trueIn 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_off0000e6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C8 5704 bytes
SHA-256: cba6a57e546d472cfbe2e9008fbf32d2aa2535a244bb966dab0316f1dbc031b8
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 11932 bytes
SHA-256: 53d71fa8c74d1c535d32cecd79bd3bfc73803d0310843a73ca1ca5794ac0f631