Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbc9d27d2794be7…

MALICIOUS

PDF

75.2 KB Created: 2021-04-08 12:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fe6dfd171948901b128adf2e3281eac8 SHA-1: 7812576e623512df4557fe0b026ccdee570b7fef SHA-256: 9bbc9d27d2794be7eb013c03d8e443381f0cfd1bc7d465855916c0fecc6bee89
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=lds+nursery+manual+lesson+28 PDF link annotation
    • http://ludirobus.getenjoyment.net/autocad_2020_tutorial_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414156/normal_5fcdd380a2496.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/95249347710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_604b20d98c0ce.pdfIn PDF document text
    • http://domotoj.sportsontheweb.net/carolina_ale_house_menu.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/ribotizobatudat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_60393d6331692.pdfIn PDF document text
    • https://ferirakiwuku.weebly.com/uploads/1/3/4/8/134899479/6478294.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/0jjjdjf/human_development_report_2011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_605aa273ad99d.pdfIn PDF document text
    • https://luvoseguz.weebly.com/uploads/1/3/4/6/134665560/rowelulavasi.pdfIn PDF document text
    • https://ritukananikunid.weebly.com/uploads/1/3/0/9/130969552/gupumobe.pdfIn PDF document text
    • http://nadipewin.mywebcommunity.org/raseku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460057/normal_60286dfc0aa71.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/jdHbhgZ/tupejejejifupag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_6d612eea3c834ab2bab5f11ac7f99762.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_b3b6b33190bb4f94a021fb6012369b37.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_19d8232d540546729aa2b318b4263cda.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_eb127bd4ccd8425b99d65d20f7c92e80.pdf?index=trueIn PDF document text
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_47bd36d2d7a04523b227771c2ad204cc.pdf?index=trueIn PDF document text
    • http://bipegokatif.onlinewebshop.net/entrepreneurship_education_book.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_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 5340 bytes
SHA-256: f3e7aee2777dca7ace3887459e1b4cc4a184da9d975eecd3a1bf7dbdb20be085
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 10796 bytes
SHA-256: 0f06a55a19c3d6333bb401ffabdefc60b210188d56ba4acb3a7ce15764a5adb0