Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd313bcf2943384b…

MALICIOUS

PDF

79.3 KB Created: 2021-03-19 13:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f1459ac009a1870a399fbc05f999938f SHA-1: a455c4d82cc9e64eeae1ecf773dac1a53e123d37 SHA-256: cd313bcf2943384bd0a3a7c661fe917fd862738a965a6e20aa8d0bd89f35de61
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO scam. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jumiwimov.ru/award?keyword=catholic+bible+tagalog+pdf PDF link annotation
    • http://olipaka.xyz/gipafevijudofqjtsv.pdfIn PDF document text
    • https://jiresuzava.weebly.com/uploads/1/3/4/7/134706808/ef4807e95.pdfIn PDF document text
    • https://rixemovupel.weebly.com/uploads/1/3/1/6/131606965/wafemujem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386851/normal_5fe0682c387d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403259/normal_6004ac4eecfb5.pdfIn PDF document text
    • http://cpskras.website/le_journal_echouroukmcfra.pdfIn PDF document text
    • https://gixinizolovuz.weebly.com/uploads/1/3/5/3/135348456/belotanofetu.pdfIn PDF document text
    • http://theharaka.online/90805577903o4dp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473340/normal_603b3e7ba95a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://giguvinelixegol.rf.gd/aviso_de_privacidad_formato_corto.pdfIn PDF document text
    • http://kofupugixujodin.epizy.com/amines_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cd39704-c508-49de-b8d2-14ab34f6aef5/how_is_annual_leave_pay_calculated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/522664fa-f3ec-4f57-8e0d-23e740be36ab/financial_peace_university_free_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f65943a-760a-4d39-8313-27b968277967/xuwemologurubovigowon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46248150-25c1-4346-890a-8c675930a970/tirif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa268d8f-8293-4a4d-964f-4de5c0147a57/komofa.pdfIn PDF document text
    • http://ziboporo.epizy.com/experimental_probability_worksheet_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a47e975-847e-4191-93ce-72b1c4ab8867/programmable_logic_controller_salary.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B4 4988 bytes
SHA-256: b0c64b21aeb0fd951741e0643285200927e896386e65379dd420bd4c67b5fb7a
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 11588 bytes
SHA-256: b27eb7713c2d26d3c11f1b61091213dcaf8150b44324e514c1507dac3ffa95dd
font_02_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e