Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f81192eda926f6…

MALICIOUS

PDF

76.2 KB Created: 2021-05-27 17:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: d8eb19db83148cae1d83701502d4c519 SHA-1: e70321cc3edbe0eb21415d95a427656543c75498 SHA-256: 06f81192eda926f60f45431145125b2d739652bfe2f735cddc5ea3761d2a3c12
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to distribute malware or phishing content through these links. No scripts were extracted, but the structure and heuristics point to a malicious document designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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://static.s123-cdn-static.com/uploads/4417675/normal_5fffe7f4d92af.pdf In PDF document text
    • https://xubivolimoba.weebly.com/uploads/1/3/0/7/130740090/kilateweneso-xataramomu-dorifopap.pdfIn PDF document text
    • https://wivirupi.weebly.com/uploads/1/3/4/6/134666213/a8965.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481052/normal_5ffe11524b8ba.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/domoman_kuvepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_6068adf17ac9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_600b54a4bc0d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_6035dfb7a0567.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393628/normal_5fe12456b25a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379611/normal_5ff30b39c5513.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_603530a2df1f0.pdfIn PDF document text
    • https://rigavimiba.weebly.com/uploads/1/3/0/8/130814992/67dcc5a7320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_604e1ad6deaeb.pdfIn PDF document text
    • https://tojetipa.weebly.com/uploads/1/3/4/2/134234581/2017181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_604f82d8bfd45.pdfIn PDF document text
    • https://pegalidaxib.weebly.com/uploads/1/3/4/6/134632492/rubojaxobajademawij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_605e04b258100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424951/normal_602cdba01ac8b.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/kufumuzojegavos.pdfIn PDF document text
    • https://foxegakadop.weebly.com/uploads/1/3/4/3/134337736/xojepomanib_ligepilimir_xokelifovinefob_xolorisipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383800/normal_603965b630aa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401983/normal_601974cde0bf9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/4NO0L8wlyOA/wb?keyword=which%20celestron%20telescope%20is%20bestPDF link annotation
    • https://uploads.strikinglycdn.com/files/6d8e1808-60d0-4920-85ec-6001b6b38c85/zezifetixowanunarigego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b810339-6ad8-4ac6-bbf0-118228b37b9c/competency_based_assessment_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72bbd215-89fc-4594-8c59-8dc2094077e6/buxitetoxisumizu.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_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 4964 bytes
SHA-256: f53e3b48c340df53581b21a98d1feeac66b3e0ad99f4439c6c42d3cc89b3a0e9
font_01_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 10412 bytes
SHA-256: d520e7a6b259e246e181313c0ae23e044218d9412578eed7186ac28c1582f447

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