Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4675bd1e2a65d9…

MALICIOUS

PDF

76.6 KB Created: 2021-05-12 02:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0d1e5ce02a2444f0188eeef41f0a0042 SHA-1: 58bf8a189dd272af0e87e34dc4d2de757fc74996 SHA-256: 5b4675bd1e2a65d94401d6888adf41398d9f0319c124859dc69ef2a35fc9d75e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, including one that appears to be a redirector to a link farm, and another that is part of a potential phishing lure. The document body, though heavily obfuscated, contains text related to a search query, suggesting a social engineering pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=is+rohnert+park+a+good+place+to+live PDF link annotation
    • http://opssmall.space/janativilinigikeno0esai.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_604958cecef4e.pdfIn PDF document text
    • http://tatuxuvoziparu.mywebcommunity.org/alimentos_y_bebidas_conalep_magdalena_contreras.pdfIn PDF document text
    • http://soinjaga.ru/79458989672vri0e.pdfIn PDF document text
    • http://copyright-rules-help.com/7516861601wl39n.pdfIn PDF document text
    • https://magijomolalol.weebly.com/uploads/1/3/1/4/131437319/kixugelutaz.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/sitimusovu.pdfIn PDF document text
    • https://wutuzorul.weebly.com/uploads/1/3/5/9/135963099/zezudezaba.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/c53c908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403540/normal_6000c9e8c4a3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393755/normal_600672002132c.pdfIn PDF document text
    • http://dakekunagefasak.sportsontheweb.net/learn_korean_books_free_download.pdfIn PDF document text
    • http://bcipreactivaperu.com/aaa_buzz_communication_albumgre86.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/37385463350.pdfIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_edeb76fea7974a03bfbcab0efafa3ac5.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_696283e4084444768ce003ebc1600f15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nemafu/fojasi.pdfIn PDF document text
    • https://f568b852-d776-40fc-afde-b4c2ef929a3a.filesusr.com/ugd/2d6fb2_0ce341a625af41a0a8d564ff42ce3c9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gosete/digital_stream_converter_box_manual.pdfIn PDF document text
    • http://wazipegemezen.atwebpages.com/setorotinotiruzogave.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_8196137a065f42338db4046782e5919c.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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 5396 bytes
SHA-256: 77d8d5d7a1859ab465305e15ea16fa09956482fc6eecc8d2940a3946b9cce709
font_01_sfnt_off0000fe94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE94 11004 bytes
SHA-256: 3ba88c10607b51fc42c7f2404ae5a6d1bc2bc3ea857d8b0f3595a1a3346096b7

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