Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c51c043f80a3ef…

MALICIOUS

PDF

75.4 KB Created: 2021-04-03 14:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3443b7ea7bf4ee416d5b70f0ba36e1ba SHA-1: 491f285bfb69e4b26cc87c7e640b418bbb331d8b SHA-256: 19c51c043f80a3ef4c8a00bdbdfb7f269cd5ac22fbf60dda73ccc298dd968b05
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically flagged as an external URI likely leading to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of external URIs suggests an attempt to redirect the user to a compromised or phishing site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=format+of+informal+letter+writing+in+english+pdf PDF link annotation
    • http://wosozage.mypressonline.com/85874523288.pdfIn PDF document text
    • http://ramuwesitavoz.mywebcommunity.org/pdf_to_excel_converter_python.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_6023e0f224da9.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/can_you_play_grand_theft_auto_5_on_xbox_one.pdfIn PDF document text
    • http://punejew.mygamesonline.org/sistem_atmosfera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_6014d6821ff54.pdfIn PDF document text
    • http://sifaritube.sportsontheweb.net/mapa_alsacia_y_selva_negra.pdfIn PDF document text
    • http://rumurel.mywebcommunity.org/smart_board_online_activities.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495681/normal_5fe9ff276aa51.pdfIn PDF document text
    • http://kajipim.mypressonline.com/nusawidogotewil.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/206adea0-106f-4b7d-b341-dba3a18943dd/que_es_la_educacion_basica_media_y_superior.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8664f891-16a2-4ba6-9841-931633755d0f/jafipuj.pdfIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/96539492873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77d1cbec-5e78-4592-9ecf-fadae811649c/maliwinexewowuzofup.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_5f13448288d74377960405b0dc9b7a56.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_48b924ce85c24d0083b72e912a7e9163.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupoti/64516463230.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/gapunotarupufopep.pdfIn PDF document text
    • http://ketabigumowun.atwebpages.com/japanese_candlestick_patterns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f486ed9d-2de6-4b7b-b980-0cee0790ded7/triumph_bonneville_t100_aftermarket_parts_and_accessories.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_b5a98e93a984454982320403d49fdae1.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_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 5500 bytes
SHA-256: 1abc398d12921213b5bf4ebbbbb9149c80f9e1909e28e1c8096cbc038334e58c
font_01_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 10792 bytes
SHA-256: 5ee1024400de362b42f8e452e1c616caeb979f8ae56f45ba63d8d9a14f2923d8

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