Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2f05d3194d9967…

MALICIOUS

PDF

120.6 KB Created: 2021-03-09 07:54:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0435c573bf4270beb82f6ca8eb2dd747 SHA-1: 2c40d3604eb5749d847c25af48a31c5e556fe7c6 SHA-256: 4f2f05d3194d9967f88acb7ccee32090de446e48257b2bb00c303deae3096f3b
186 Risk Score

Malware Insights

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

This PDF document contains a significant number of external links, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' indicates that the PDF is designed to host numerous links, likely to manipulate search engine results or redirect users to malicious content. The presence of ClamAV detection and ML classification further supports its malicious nature. While no scripts were explicitly extracted, the structure suggests it's designed to lead users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/123?utm_term=ff14+fashion+report+week+85 PDF link annotation
    • https://cdn.sqhk.co/vitimosugu/ghbKX8J/mercs_of_boom_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/iayCACB/fewenugupizirirawewetudol.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/QUAgjic/zawokoxodazumixixe.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/gle3heq/bmx_freestyle_extreme_3d_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/Zjaijgh/23047986932.pdfIn PDF document text
    • http://losinglotterynumbers.com/strategic_management_dictionaryw00qh.pdfIn PDF document text
    • http://sandwichhq.club/dorubagimqj59z.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/iegiEvR/beautiful_dreamer_song_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_a7e23dfaaf8c484c859f2a6106b0aaa4.pdf?index=trueIn PDF document text
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_900324783a1a40b18be657e89d97cde5.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_e0d0014074c44df4927c8cbb2edcb64f.pdf?index=trueIn PDF document text
    • https://4fe85328-8dbf-40e9-afa8-2c8d6ff8a9c8.filesusr.com/ugd/9c0842_8a7ce26012924e8888edd832033fe0e1.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_fd6bf37dcc064d4ba1420bbdbc119a2b.pdf?index=trueIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_bba23303719340f9835192c0b5a5faed.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_e90d9b5978924aa4ae2754c010650396.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_dfdf1f7157544515a2a305e45f2df0af.pdf?index=trueIn PDF document text
    • https://01477de9-116b-42a6-a62c-54244336611e.filesusr.com/ugd/dea9e9_3c26ad1f4a1c4313b9ba0477f90a2fa7.pdf?index=trueIn PDF document text
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_31fc02a9816d4083b286c0dce5df91e0.pdf?index=trueIn PDF document text
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_6f2a33aa0d7c4c7e9cd4223486f4b26e.pdf?index=trueIn PDF document text
    • https://878ee1be-828d-48b9-a24a-84283cf66a1c.filesusr.com/ugd/86936c_eb469be7803f4d36bcf5ae286a44b924.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F8D 12452 bytes
SHA-256: 5113aa7f56bfc276dfca865fa44ee7d2f3a853f0f04d7a81e2a779223d8b174f
font_01_sfnt_off000198ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198BA 5528 bytes
SHA-256: b0b6a7c0f9a39c73b5bd385ea2d31cc64763d367117b1e70c86e5899d0dd989c
font_02_sfnt_off0001aba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABA5 12164 bytes
SHA-256: b35c1eb57a91ba469330bdd1678437a82162ac19599c75d84808ffd14c1e5ecf

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