Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0748385334deb2…

MALICIOUS

PDF

51.5 KB Created: 2020-10-17 04:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ffbe918b9a5f1140f72d451defb58102 SHA-1: 66777f26b13f6b9292038c0e922079632b31b121 SHA-256: 0b0748385334deb2d5e6969ebcf1f51764447ff9e8ea75dd6b7e6a6cdcd7f0b3
244 Risk Score

Malware Insights

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

This PDF document functions as a credential phishing lure, impersonating Facebook and directing users to a malicious redirector URL. The document contains a large number of embedded links, many pointing to disposable hosting services, which are characteristic of SEO link farms used to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs confirms the intent to lead users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/gevozodokip.pdf.
  • 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.
  • 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://ggtraff.ru/strik?keyword=verify+check+online+free In PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/gevozodokip.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/1037622.pdfIn PDF document text
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/vojazusuvuxik_dadegivanom_gedelodiwuba_bowafewakowab.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/fomado.pdfIn PDF document text
    • https://bigogewoxof.weebly.com/uploads/1/3/0/7/130739615/5939531.pdfIn PDF document text
    • https://tudupumodowi.weebly.com/uploads/1/3/1/4/131406798/xexijolanidev.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/b628c54eef4e3.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/nibezefosir-wonabodafiduw.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/zezavuwonenuno-vipabagatopo.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/zuwerevufu_fakodo_wotinete_rajizelu.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/9b53ec72f.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/gerilulivomek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1225/7952/files/65337248226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f7f4201-45f9-44a8-9c04-218fee7713af/nonaliwurudezularefel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b02313-de1f-4014-b5e8-5a451a160c2d/bezizaluxelowexoxubaxan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b074ebd-b86c-485b-973b-9b67de61c68d/8096316169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6302dd3-03c3-414b-9cc0-0307d3f3edf2/17426605094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72036ee8-eb50-417d-9012-203670a350f8/wupetid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ef75e1-dd49-431a-8654-fa2e267f06fa/27227689986.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5bd73b4-9994-4986-93cb-ca5e1e7d8dff/lapawetebavipij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e020bd-dc24-4e79-87f6-72c729128825/sekemepemidanopuvu.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_off00008bd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BD8 4712 bytes
SHA-256: aca1d7f569e02ee6b5cf94696893d95673f8da1546914e2b2d70058d69954d41
font_01_sfnt_off00009bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDC 10688 bytes
SHA-256: adc6e5c36020f35f732664db1ae46fcaebdd79146177ca23bce0e566f661de0d

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