Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf4aa448a3023f3…

MALICIOUS

PDF

84.8 KB Created: 2021-03-24 10:02:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0a2fa5da4fef7c21ff7c594c6b21ff6c SHA-1: 495f69c238440348dbd990ab6bc4162f793ab4a8 SHA-256: 4bf4aa448a3023f3066e5a1c157e4dfd8d3db2801b1d1b262643ac77e4f2ce4a
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites under the guise of providing PDF merging tools. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, many hosted on disposable domains, suggesting a malicious intent to drive traffic or distribute further payloads. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=fusionner+deux+pdf+acrobat+reader PDF link annotation
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/xeluz.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/texas_ti-82_stats_graphing_calculator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421639/normal_5fef51784fb43.pdfIn PDF document text
    • https://xabetidadema.weebly.com/uploads/1/3/1/3/131398123/6762505.pdfIn PDF document text
    • http://bimizuzi.sportsontheweb.net/calculus_early_transcendental_functions_4th_edition_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_600c774b00e10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425010/normal_5fe4a9dfd3a19.pdfIn PDF document text
    • https://womawojixamukof.weebly.com/uploads/1/3/0/7/130740010/5212329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_6001233c43894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379731/normal_5fcb14a4af298.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://resilasijajatil.myartsonline.com/53379732548.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_663e1105cb8948278d19d8c2993e32c7.pdf?index=trueIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_78e74767931d42259ac7e89874b9b2b4.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_7ddc277a4dd54c9faec5816ad96bd61c.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_e1426559753340deb07e11ab19af65c6.pdf?index=trueIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_536af5c5146b4c50984926c9ed820631.pdf?index=trueIn PDF document text
    • https://a7474f5d-6ec7-41e4-954d-8cb0a6a0c5ec.filesusr.com/ugd/b987d2_5aca0f076e7f4dbaacc8f8aed698e572.pdf?index=trueIn PDF document text
    • http://xekazaz.myartsonline.com/wevivunij.pdfIn PDF document text
    • http://gulagopafed.onlinewebshop.net/bathroom_pass_sign_out_sheet.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_1598879fe4de4c00b25381d5176680b9.pdf?index=trueIn PDF document text
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_d91cbb1fb84d4f1b8a4e4498b099554e.pdf?index=trueIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_83ab3282469e4175a24215d36fa76dfc.pdf?index=trueIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_b528ef981dae47e8ad5ac2b9f7341ae2.pdf?index=trueIn PDF document text
    • http://dufojamimusim.atwebpages.com/tagabakororigikilulejulaj.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_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 5280 bytes
SHA-256: 475d61a8b556839a00acdd36bd67cbe6505f6549c4b953a5e7b5d96d37110a26
font_01_sfnt_off00011acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACB 13308 bytes
SHA-256: ad45fd226e954510201b3bf8920889ee636fddc31e88a91e880d36be99fbf386

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