Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3be084ac5593ef…

MALICIOUS

PDF

84.7 KB Created: 2021-03-31 19:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 034c2e19a41e577e186726adff0a8f37 SHA-1: 8fc638450695d4dc3372aaf7b7e96360988d454a SHA-256: 0a3be084ac5593efc0388c4db88c1b5408b427d0b5608de5a3b37c17119d847c
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 direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=buddenbrooks+h%25C3%25B6rbuch+ungek%25C3%25BCrzt PDF link annotation
    • https://tebiwexarug.weebly.com/uploads/1/3/1/3/131380746/8a7ffea5.pdfIn PDF document text
    • http://zosazufinur.mygamesonline.org/94645666340.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_5fe68dc498da6.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/naming_benzene_rings.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/botanical_names_of_common_plants.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/laler.pdfIn PDF document text
    • http://gazozasi.scienceontheweb.net/dnombrement_des_coliformes_totaux_et_fcaux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386347/normal_5febbfd8db522.pdfIn PDF document text
    • http://garobunatuxovi.scienceontheweb.net/investment_management_strategies.pdfIn PDF document text
    • https://nelunozulugekis.weebly.com/uploads/1/3/0/7/130739970/216926.pdfIn PDF document text
    • http://xomutukegadoj.mypressonline.com/how_long_does_it_take_for_evening_primrose_oil_to_work_for_breast_pain.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/vuruwavomelibu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368962/normal_5fde9158af4bb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_dc181e85d27247be8129e0d55bdbb59e.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_28a3ae0d533d4919b3bc2d08d06f3101.pdf?index=trueIn PDF document text
    • https://507f79ed-2408-4027-b124-45ed49bded7d.filesusr.com/ugd/2de61b_224468ef49174522a237b27370b182b8.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_4dc4a256797b4c8faf2b0194511d3e9c.pdf?index=trueIn PDF document text
    • http://dowuvoduwitovos.atwebpages.com/i_wish_you_more_writing_activities.pdfIn PDF document text
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_3f053af0f0584a7eb2d7c2508d9f52f5.pdf?index=trueIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_988e6f21df6d42619576b9dedc15017a.pdf?index=trueIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_53364cee547c4e1fb8dec0626d670740.pdf?index=trueIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_6f41e14e8b324bc3955b1bea27e867d2.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_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 5520 bytes
SHA-256: 3d8f7c4509b491a25dbc4c6e35e276c53a831823a7c731bfc219dc414567200d
font_01_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 12248 bytes
SHA-256: f9dcbefad8e1873be7f12c53680b6623b845064bffd49bf3ef99fe912a702afd